# Selected Publications

## 2012

**Unequal layer densities in bilayer Wigner crystal at high magnetic fields**

Zhihai Wang, Yong P. Chen, Han Zhu, L.W. Engel, D.C. Tsui, E. Tutuc, and M. Shayegan, *Phys. Rev. B.*, **85**, 195408 (2012).

**Ballistic transport of (001) GaAs two-dimensional holes through a strain-induced lateral superlattice**

D. Kamburov, H. Shapourian, M. Shayegan, L.N. Pfeiffer, K.W. West, K.W. Baldwin, and R. Winkler, *Phys. Rev. B.*, **85**, 121305(R) (2012).

## 2011

**Evolution of the 7/2 Fractional Quantum Hall State in Two-Subband Systems**

Yang Liu, J. Shabani, D. Kamburov, M. Shayegan, L.N. Pfeiffer, K.W. West, and K.W. Baldwin, *Phys. Rev. Lett.*, **107**, 266802 (2011).

**Stability of the q/3 fractional quantum Hall states**

Yang Liu, J. Shabani, and M. Shayegan, *Phys. Rev. B*, **84**, 195303 (2011).

**Effective mass and spin susceptibility of dilute two-dimensional holes in GaAs**

YenTing Chiu, Medini Padmanabhan, T. Gokmen, J. Shabani, E. Tutuc, M. Shayegan, and R. Winkler, *Phys. Rev. B*, **84**, 155459 (2011).

**Imaging of Coulomb-Driven Quantum Hall Edge States**

Keji Lai, Worasom Kundhikanjana, Michael A. Kelly, Zhi-Xun Shen, Javad Shabani, and Mansour Shayegan, *Phys. Rev. Lett.*, **107**, 176809 (2011).

**Reentrant nu = 1 Quantum Hall State in a Two-Dimensional Hole System**

A.L. Graninger, D. Kamburov, M. Shayegan, L.N. Pfeiffer, K.W. West, K.W. Baldwin, and R. Winkler, *Phys. Rev. Lett.*, **107**, 176810 (2011).

**Anomalous Robustness of the nu = 5/2 Fractional Quantum Hall State near a Sharp Phase Boundary**

Yang Liu, D. Kamburov, M. Shayegan, L.N. Pfeiffer, K.W. West, and K.W. Baldwin, *Phys. Rev. Lett.*, **107**, 176805 (2011).

## 2010

**Fractional Quantum Hall Effect at High Fillings in a Two-Subband Electron System**

J. Shabani, Y. Liu, and M. Shayegan, *Phys. Rev. Lett.*, **105**, 246805 (2010).

**Contrast between spin and valley degrees of freedom**

T. Gokmen, M. Padmanabhan, and M. Shayegan, *Phys. Rev. B*, **81**, 235305 (2010).

**Transference of transport anisotropy to composite fermions**

T. Gokmen, M. Padmanabhan, and M. Shayegan, *Nature Physics* (2010).

**Composite fermion valley polarization energies: Evidence for particle-hole asymmetry**

M. Padmanabhan, T. Gokmen, and M. Shayegan, *Phys. Rev. B* **81**, 113301 (2010).

**Density and strain dependence of nu = 1 energy gap in a valley-degenerate AlAs quantum well**

T. Gokmen, and M. Shayegan, *Phys. Rev. B* **81**, 115336 (2010).

**Ferromagnetic Fractional Quantum Hall States in a Valley Degenerate Two-Dimensional Electron System**

M. Padmanabhan, T. Gokmen, and M. Shayegan, *Phys. Rev. Lett.* **104**, 016805 (2010).

## 2009

** Evidence for Developing Fractional Quantum Hall States at Even Denominator 1/2 and 1/4 Fillings in Asymmetric Wide Quantum Wells**

J. Shabani, T. Gokmen, Y.T. Chiu, and M. Shayegan, *Phys. Rev. Lett.* **103**, 256802 (2009).

**Density Dependence of Valley Polarization Energy for Composite Fermions**

M. Padmanabhan, T. Gokmen, and M. Shayegan, *Phys. Rev. B.* **80**, 035423 (2009).

**Correlated States of Electrons in Wide Quantum Wells at Low Fillings: The Role of Charge Distribution Symmetry**

J. Shabani, T. Gokmen, and M. Shayegan, *Phys. Rev. Lett.* **103**, 046805 (2009).

**Effective Mass Suppression in a Ferromagnetic Two-Dimensional Electron Liquid**

R. Asgari, T. Gokmen, B. Tanatar, M. Padmanabhan, and M. Shayegan, *Phys. Rev. B.* **79**, 235324 (2009).

**Effective Mass Suppression Upon Complete Spin-Polarization in an Isotropic Two-Dimensional Electron System**

T. Gokmen, M. Padmanabhan, K. Vakili, E. Tutuc, and M. Shayegan, *Phys. Rev. B.* **79**, 195311 (2009).

## 2008

**Spin Susceptibility and Effective Mass of Two-Dimensional Electrons in MgxZn1-xO/ZnO Heterostructures**

A. Tsukazaki, A. Ohtomo, M. Kawasaki, S. Akasaka, H. Yuji, K. Tamura, K. Nakahara, T. Tanabe, A. Kamisawa, T. Gokmen, J. Shabani, and M. Shayegan, *Phys. Rev. B.* **78**, 233308 (2008).

**Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons**

T. Gokmen, M. Padmanabhan, O. Gunawan, Y.P. Shkolnikov, K. Vakili, E.P. De Poortere, and M. Shayegan, *Phys. Rev. B.* **78**, 233306 (2008).

**High-quality quantum point contact in two-dimensional GaAs (311)A hole system**

J. Shabani, J. R. Petta, and M. Shayegan, *Appl. Phys. Lett.* **93**, 212101 (2008).

**Enhancement of Valley Susceptibility Upon Complete Spin Polarization**

M. Padmanabhan, T. Gokmen, and M. Shayegan, *Phys. Rev. B.* **78**, 161301(R) (2008).

**Dependence of Effective Mass on Spin and Valley Degrees of Freedom**

T. Gokmen, M. Padmanabhan, and M. Shayegan, *Phys. Rev. Lett.* **101**, 146405 (2008).

**Effective Mass Suppression in Spin-polarized Dilute Two-dimensional Electron Systems**

M. Padmanabhan, T. Gokmen, N.C. Bishop, and M. Shayegan, *Phys. Rev. Lett.* **101**, 026402 (2008).

**Characterization of the Anomalous Giant Piezoresistance in AlAs Two-dimensional Electrons with Antidot Lattices**

O. Gunawan, T. Gokmen, E.P. De Poortere, and M. Shayegan, *Semicond. Sci. Technol.* **23**, 085005 (2008).

**Strain-induced Fermi Contour Anisotropy of GaAs Two-dimensional Holes**

J. Shabani, M. Shayegan, and R. Winkler, *Phys. Rev. Lett.* **100**, 096803 (2008).

**Anomalous Giant Piezoresistance in AlAs Two-dimensional Electrons with Antidot Lattices**

O. Gunawan, T. Gokmen, Y.P. Shkolnikov, E.P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **100**, 036602 (2008).

## 2007

**Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass**

T. Gokmen, M. Padmanabhan, E. Tutuc, M. Shayegan, S. De Palo, S. Moroni, and G. Senatore, *Phys. Rev. B* **76**, 233301 (2007).

**NMR Study of Large Skyrmions in Al0.13Ga0.87As Quantum Wells**

V.F. Mitrovic, H. Horvatic, C. Berthier, S.A. Lyon, and M. Shayegan, *Phys. Rev. B* **76**, 115335 (2007).

**Charge Neutral Counterflow Transport at Filling Factor One in GaAs Hole Bilayers**

E. Tutuc and M. Shayegan, *Solid State Communications* **144**, 405-408 (2007).

**Anisotropic Low-temperature Piezoresistance in (311)A GaAs Two-dimensional Holes**

B. Habib, J. Shabani, E.P. De Poortere, M. Shayegan, and R. Winkler, *Appl. Phys. Lett.* **91**, 012107 (2007).

**In-plane Magnetic Field-induced Metal-insulator Transition in (311)A GaAs 2D Hole Systems Probed by Thermopower**

S. Faniel, L. Moldovan, A. Vlad, E. Tutuc, N. Bishop, S. Melite, M. Shayegan, and V. Bayot, *Phys. Rev. B* **76** (Rapid Communications), 161307 (2007).

**Pinning Modes and Interlayer Correlation in High Magnetic Field Bilayer Wigner Solids**

Zhihai Wang, Y.P. Chen, L.W. Engel, D.C. Tsui, E. Tutuc, and M. Shayegan, *Phys. Rev. Lett.* **99**, 136804 (2007).

**Valley Polarization and Susceptibility of Composite Fermions around ν = 3/2**

N.C. Bishop, M. Padmanabhan, K. Vakili, Y.P. Shkolnikov, E.P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **98**, 266404 (2007).

**Quantum Hall Effect in a Multi-valley Two-dimensional Electron System** [invited paper; International Conference on Physics of Semiconductors at High Magnetic Fields, August 2006]

M. Shayegan, E.P. De Poortere, O. Gunawan, Y.P. Shkolnikov, E. Tutuc, and K. Vakili, *International Journal of Modern Physics B* **21**, 1388-1397 (2007).

**Strong Aharonov-Bohm Oscillations in a GaAs Hole Ring Fabricated via Oxidation Lithography**

B. Habib, E. Tutuc, and M. Shayegan, *Appl. Phys. Lett.* **90**, 152104 (2007).

**Dephasing Time of Two-dimensional Holes in GaAs Open Quantum Dots**

S. Faniel, B. Hackens, A. Vlad, L. Moldovan, C. Gustin, B. Habib, S. Melinte, M. Shaygean, V. Bayot, *Phys. Rev. B* **75**, 193310 (2007).

**Tuning of the Spin-orbit Interaction in Two-dimensional GaAs Holes via Strain**

B. Habib, J. Shabani, E.P. De Poortere, M. Shayegan, and R. Winkler, *Phys. Rev. B* **75**, 153304 (2007).

**AlAs 2D Electrons in an Antidot Lattice: Electron Pinball with Elliptical Fermi Contours**

O. Gunawan, E.P. De Poortere, and M. Shayegan, *Phys. Rev. B* **75**, 081304 (2007).

**Spin-valley Phase Diagram of the Two-dimensional Metal-insulator Transition**

O. Gunawan, T. Gokmen, K. Vakili, M. Padmanabhan, E.P. De Poortere, and M. Shayegan, *Nature Physics* **3**, 388-391 (2007). See commentary (“News and Views”) **Metal-insulator Transition: A Plane Mystery** by Jurgen H. Smet, *Nature Physics* **3**, 370-372 (2007).

## 2006

**Quantized Conductance in an AlAs 2D Electron System Quantum Point Contact**

O. Gunawan, B. Habib, E.P. De Poortere, and M. Shayegan, *Phys. Rev. B* **74**, 155436 (2006).

**Zeeman Splitting of Interacting Two-dimensional Electrons with Two Effective Masses**

K. Vakili, E. Tutuc, and M. Shayegan, *Solid State Communications* **140**, 285-288 (2006).

**Dependence of Persistent Gaps at Landau Level Crossings on Relative Spin**

K. Vakili, T. Gokmen, O. Gunawan, Y.P. Shkolnikov, E.P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **97**, 116803 (2006).

**Two-dimensional Electrons Occupying Multiple Valleys in AlAs** (review article)

M. Shayegan, E.P. De Poortere, O. Gunawan, Y.P. Shkolnikov, E. Tutuc, and K. Vakili, *Phys. Stat. Sol. (b)* **243**, 3629-3642 (2006).

**High-mobility Out-of-plane Valley Occupation in AlAs Quantum Wells**

K. Vakili, Y.P. Shkolnikov, E. Tutuc, E.P. De Poortere, M. Padmanabhan, and M. Shayegan, *Appl. Phys. Lett.* **89**, 172118 (2006).

**Valley Susceptibility of an Interacting Two-dimensional Electron System**

O. Gunawan, Y.P. Shkolnikov, K. Vakili, T. Gokmen, E.P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **97**, 186404 (2006).

**Flatland Electrons in High Magnetic Fields**

M. Shayegan, book chapter in "High Magnetic Fields: Science and Technology," Vol. 3, edited by Fritz Herlach and Noboru Miura, (World Scientific, Singapore, 2006), pp. 31-60.

## 2005

**Thermopower Evidence for Wigner Crystallization in the Insulating Phase of Two-dimensional GaAs Bilayer Hole Systems**

S. Faniel, E. Tutuc, E.P. De Poortere, C. Gustin, A. Vlad, L. Moldovan, S. Melinte, M. Shayegan, and V. Bayot, EP2DS-16, *Physica E* **34**, 120-123 (2005).

**Stability of Charged Impurities in a Coupled Single Electron Transistor and Antidot System**

L.A. Farina, X. Bai, C. Kurdak, S, Chakrabarti, P. Bhattacharya, and M. Shayegan, EP2DS-16, *Physica E* **34**, 187-190 (2005).

**Spin-dependent Resistivity and Quantum Hall Ferromagnetism in Two-dimensional Electrons Confined to AlAs Quantum Wells**

K. Vakili, Y.P. Shkolnikov, E. Tutuc, N.C. Bishop, E.P. De Poortere, and M. Shayegan, EP2DS-16, *Physica E* **34**, 89-92 (2005).

**Bilayer Counterflow Transport at Filling Factor One in the Strong Interacting Regime**

E. Tutuc and M. Shayegan, Invited paper at EP2DS-16, *Physica E* **34**, 11-15 (2005).

“Opportunities in High Magnetic Field Science,”

M. Shayegan, co-author, (The National Academies Press, Washington, D.C., 2005); ISBN 0-309-09582-4.

**Observation of Quantum Hall "Valley Skyrmions"**

Y. P. Shkolnikov, S. Misra, N. C. Bishop, E. P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **95**, 066809 (2005).

**Spin-dependent Resistivity at Transitions between Integer Quantum Hall States**

K. Vakili, Y.P. Shkolnikov, E. Tutuc, N.C. Bishop, E.P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **94**, 176402 (2005).

**Orbital Effect, Subband Depopulation, and Conductance Fluctuations in Ballistic Quantum Dots under a Tilted Magnetic Field**

C. Gustin, S. Faniel, B. Hackens, S. Melinte, M. Shayegan, and V. Bayot, *Phys. Rev. B* **71** 155314 (2005).

**Coulomb drag near the metal-insulator transition in two dimensions**

R. Pillarisetty, H. Noh, E. Tutuc, E.P. De Poortere, K. Lai, D.C. Tsui, and M. Shayegan, *Phys. Rev. B* **71**, 115307 (2005).

**Thermopower of Interacting Two-dimensional GaAs Bilayer Hole Systems in the Reentrant Insulating Phase near ν = 1**

S. Faniel, E. Tutuc, C. Gustin, A. Vlad, S. Melinte, V. Bayot, and M. Shayegan, *Phys. Rev. Lett.* **94**, 046802 (2005).

**Spin Polarization Dependence of the Coulomb Drag at large r _{s}**

R. Pillarisetty, H. Noh, E. Tutuc, E.P. De Poortere, D.C. Tsui, and M. Shayegan,

*Phys. Rev Lett.*

**94**, 016807 (2005).

**Counterflow Measurements in GaAs Hole Bilayers: Possible Evidence for Excitonic Condensation** (invited paper; International Conference on High Magnetic Fields in Semiconductor Physics, Tallahassee, FL, July 2004)

E. Tutuc and M. Shayegan, *International Journal of Modern Physics B* **18**, 3685-3692 (2004).

## 2004

**Ballistic Transport in AlAs Two-dimensional Electrons**

O. Gunawan, Y.P. Shkolnikov, E.P. De Poortere, E. Tutuc, and M. Shayegan, *Phys. Rev. Lett.* **93**, 246603 (2004).

**Insulating Behavior of Dilute Two-dimensional Holes in GaAs under an In-plane Magnetic Field**

H. Noh, J. Yoon, D.C. Tsui, and M. Shayegan, *Phys. Rev. B* **70**, 241306 (2004).

**Interacting GaAs Bilayer Hole Systems with Layer Density Imbalance**

E. Tutuc, S. Melinte, E.P. De Poortere, R. Pillarisetty, and M. Shayegan, *Physica E* **22**, 32 (2004).

**Frictional Drag between Dilute Two-dimensional Hole systems**

R. Pillarisetty, H. Noh, E. Tutuc, E.P. De Poortere, D.C. Tsui, and M. Shayegan, *Physica E* **22**, 300 (2004).

**Giant low-temperature piezoresistance effect in AlAs two-dimensional electrons**

Y. P. Shkolnikov, K. Vakili, E. P. De Poortere, and M. Shayegan, *Appl. Phys. Lett.* **85**, 3766 (2004).

**Negative differential Rashba effect in two-dimensional hole systems**

B. Habib, E. Tutuc, S. Melinte, M. Shayegan, D. Wasserman, S. A. Lyon, R. Winkler, *Appl. Phys. Lett.* **85**, 3151 (2004).

**A hybrid Al _{0.10}Ga_{0.90}As/AlAs bilayer electron system with tunable g-factor**

E. P. De Poortere and M. Shayegan,

*Appl. Phys. Lett.*

**84**, 3837 (2004).

**Counterflow measurements in strongly correlated GaAs hole bilayers: evidence for electron-hole pairing**

E. Tutuc, M. Shayegan, D.A. Huse, *Phys. Rev. Lett.* **93**, 036802 (2004).

**Spin susceptibility of two-dimensional electrons in narrow AlAs quantum wells**

K. Vakili, Y. P. Shkolnikov, E. Tutuc, E. P. De Poortere, M. Shayegan, *Phys. Rev. Lett.* **92**, 226401 (2004).

**Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom**

Y. P. Shkolnikov, K. Vakili, E. P. De Poortere, M. Shayegan, *Phys. Rev. Lett.* **92**, 246804 (2004).

**Laterally Modulated 2D Electron System in the Extreme Quantum Limit**

S. Melinte, Mona Berciu, Chenggang Zhou, E. Tutuc, S. J. Papadakis, C. Harrison, E. P. De Poortere, Mingshaw Wu, P. M. Chaikin, M. Shayegan, R. N. Bhatt, and R. A. Register, * Phys. Rev. Lett.* **92**, 036802 (2004).

**Spin splitting in GaAs (100) two-dimensional holes**

B. Habib, E. Tutuc, S. Melinte, M. Shayegan, D. Wasserman, S. A. Lyon, and R. Winkler, *Phys. Rev. B* **69**, 113311 (2004).

**Realization of an Interacting Two-Valley AlAs Bilayer System**

K. Vakili, Y. P. Shkolnikov, E. Tutuc, E. P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **92**, 186404 (2004).

## 2003

**In-plane Magnetodrag between Dilute Two-dimensional Systems**

R. Pillarisetty, H. Noh, E. Tutuc, E.P. De Poortere, D.C. Tsui, and M. Shayegan, *Phys. Rev. Lett.* **90**, 226801 (2003).

**Multiple Interacting Bilayer Electron System: Magnetotransport and Heat Capacity Measurements**

E. Grivei, S. Melinte, V. Bayot, H.C. Manoharan, and M. Shayegan, *Phys. Rev. B* **68**, 193404 (2003).

**Evidence for Universal Conductance Fluctuations in an Open Quantum Dot under a Strictly Parallel Magnetic Field**

C. Gustin, S. Faniel, B. Hackens, E.P. DePoortere, M. Shayegan, and V. Bayot, *Physica E* **17**, 154-155 (2003).

**Magnetism and Pseudo-magnetism in Quantum Hall Systems**

E.P. De Poortere, E. Tutuc, R. Pillarisetty, S. Melinte, and M. Shayegan, *Physica E* **20**, 123 (2003).

**Parallel Magnetic Field-induced Conductance Fluctuations in One- and Two-subband Ballistic Quantum Dots**

C. Gustin, S. Faniel, B. Hackens, S. Melinte, M. Shayegan, and V. Bayot, *Phys. Rev. B* **68**, 241305 (2003).

**Low-temperature, in situ tunable, uniaxial stress measurements in semiconductors using a piezoelectric actuator**

M. Shayegan, K. Karrai, Y. P. Shkolnikov, K. Vakili, E. P. De Poortere, and S. Manus, *Appl. Phys. Lett.* **83**, 5235 (2003).

**Layer Charge Instability in Unbalanced Bilayer Systems in the Quantum Hall Regime**

E. Tutuc, R. Pillarisetty, S. Melinte, E. P. De Poortere, and M. Shayegan, *Phys. Rev. B* **68**, 201308 (2003).

**Critical Resistance of the Quantum Hall Ferromagnet in AlAs 2D Electrons**

E. P. De Poortere, E. Tutuc, and M. Shayegan, *Phys. Rev. Lett.* **91**, 216802 (2003).

**In-Plane Magnetodrag between Dilute Two-Dimensional Systems**

R. Pillarisetty, H. Noh, E. Tutuc, E. P. De Poortere, D. C. Tsui and M. Shayegan, *Phys. Rev. Lett.* **90**, 226801 (2003).

**Role of Finite Layer Thickness in Spin-Polarization of GaAs 2D Electrons in Strong Parallel Magnetic Fields**

E. Tutuc, S. Melinte, E. P. De Poortere, M. Shayegan, and R. Winkler, *Phys. Rev. B* **67**, 241309 (2003).

**Field-Effect Persistent Photoconductivity in AlAs and GaAs Quantum Wells with AlGaAs barriers**

E. P. De Poortere, Y. P. Shkolnikov, and M. Shayegan, *Phys. Rev. B* **67**, 153303 (2003).

**Role of Density Imbalance in an Interacting Bilayer Hole System**

E. Tutuc, S. Melinte, E. P. De Poortere, R. Pillarisetty, and M. Shayegan, *Phys. Rev. Lett.* **91**, 076802 (2003).

## 2002

**Aharonov-Bohm Oscillations Measured in GaAs Two-Dimensional Holes: Observation of Berry's Phase**

Jeng-Bang Yau, E. P. De Poortere, and M. Shayegan, *Physica E* **12**, 758-761 (2002).

**Hysteretic Resistance Spikes at Transitions between Quantum Hall Ferromagnets in AlAs 2D Electrons**

E.P. De Poortere, E. Tutuc, and M. Shayegan, *Physica E* **12**, 36-38 (2002).

**Measurements of the Effective g-factor in Dilute GaAs 2D Electrons**

E. Tutuc and M. Shayegan, *Physica E* **12**, 420-423 (2002).

**Evidence for Spin-orbit Effects in an Open Ballistic Quantum Dot**

B. Hackens, C. Gustin, V. Bayot, and M. Shayegan, *Physica E* **12**, 833-836 (2002).

**Spin Polarization and Transition from Metallic to Insulating Behavior in 2D Systems**

E. Tutuc, E.P. De Poortere, S.J. Papadakis, M. Shayegan, *Physica E* **13**, 748-751 (2002).

**Probing Spin Physics in the Quantum Hall Regime by Heat Capacity and Magnetotransport Measurements**

S. Melinte, M. Shayegan, and V. Bayot, *Comptes Rendus Physique* **13**, 667-676 (2002).

**NMR Investigation of How Free Composite Fermions Are at ? = ½**

N. Freytag, M. Horvatic, C. Berthier, M. Shayegan, and L.P. Levy, *Phys. Rev. Lett.* **89**, 246804 (2002).

**Valley Splitting of AlAs Two-Dimensional Electrons in a Perpendicular Magnetic Field**

Y. P. Shkolnikov, E. P. De Poortere, E. Tutuc, and M. Shayegan, *Phys. Rev. Lett.* **89**, 226805 (2002).

**Magnetic-Field-Induced Spin Polarization of AlAs Two-Dimensional Electrons**

E. P. De Poortere, E. Tutuc, Y. P. Shkolnikov, K. Vakili, and M. Shayegan, *Phys. Rev. B* **66**, 161308 (2002).

**Aharonov-Bohm Oscillations with Spin: Evidence for Berry's Phase**

J. B. Yau, E. P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **88**, 146801 (2002).

**Enhanced Electron Mobility and High Order Fractional Quantum Hall States in AlAs Quantum Wells**

E. P. De Poortere, Y. P Shkolnikov, E. Tutuc, S. J. Papadakis, M. Shayegan, E. Palm and T. Murphy, *Appl. Phys. Lett.* **80**, 1583 (2002).

**Spin Polarization and g Factor of a dilute GaAs Two-Dimensional Electron System**

E. Tutuc, S. Melinte, and M. Shayegan,

*Phys. Rev. Lett.*

**88**, 036805 (2002).

**Frictional Drag between Two Dilute Two-Dimensional Hole Layers**

R. Pillarisetty, H. Noh, D. C. Tsui, E. P. De Poortere, E. Tutuc, and M. Shayegan, *Phys. Rev. Lett.* **89**, 016805 (2002).

**Low-Field Magnetoresistance in GaAs 2D Holes**

S. J. Papadakis, E. P. De Poortere, H. C. Manoharan, J. B. Yau, M. Shayegan, and S. Lyon, *Phys. Rev. B* **65**, 245312 (2002).

**Determination of the Longitudinal Resistance of Incompressible Strips through Imaging of Charge Motion**

P.I. Glicofridis, G. Finkelstein, R.C. Ashoori, and M. Shayegan, *Phys. Rev. B* **65**, 121312 (2002).

**Anomalous Rashba Spin-Splitting in Two-Dimensional Hole Systems**

R. Winkler, H. Noh, E. Tutuc, and M. Shayegan, *Phys. Rev. B* **65**, 155303 (2002).

## 2001

**In-plane Magnetic Field-Induced Spin Polarization and Transition to Insulating Behavior in Two-dimensional Hole Systems**

E. Tutuc, E. P. De Poortere, S. J. Papadakis, and M. Shayegan, *Phys. Rev. Lett. ***86**, 2858 (2001).

**Spin Polarization of Two-Dimensional Electrons in GaAs Quantum Wells around Landau Level Filling ? = 1 from NMR Measurements of Ga Nuclei**

S. Melinte, N. Freytag, M. Horvatic, C. Berthier, L. P. Lévy, V. Bayot, and M. Shayegan, *Phys. Rev. B* **64**, 085327 (2001).

**Nonmonotonic Magnetic Field and Density Dependence of In-Plane Magnetoresistance in Dilute Two-Dimensional Holes in GaAs/AlGaAs**

H. Noh, J. Yoon, D. C. Tsui, and M. Shayegan, *Phys. Rev. B* **64**, 081309(R) (2001).

**New Phase Transition between Partially and Fully Polarized Quantum Hall States with Charge and Spin Gaps at ? = 2/3**

N. Freytag, Y. Tokunaga, M. Horvatic, C. Berthier, M. Shayegan, and L.P. Levy, *Phys. Rev. Lett.* **87**, 136801 (2001).

## 2000

**Resistance Spikes at Transitions between Quantum Hall Ferromagnets**

E. P. De Poortere, E. Tutuc, S. J. Papadakis, and M. Shayegan, *Science* **290**, 1546 (2000).

**
Highly Anisotropic Zeeman Splitting of Two-dimensional Hole Systems**

R. Winkler, S. J. Papadakis, E. P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **85**, 4574 (2000).

**Anomalous Thermopower in the Metallic-like Phase of a 2D Hole System**

L. Moldovan, S. Melinte, V. Bayot, S.J. Papadakis, E. P. De Poortere, and M. Shayegan, *Phys. Rev. Lett.* **85**, 4369 (2000).

**
Highly Anisotropic Commensurability Oscillations in Two-dimensional Holes at the GaAs/AlGaAs (311)A Interface**

J. B. Yau, J. P. Lu, H. C. Manoharan, and M. Shayegan, *Physica E* **6**, 453 (2000).

**Universality at Integer Quantum Hall Transitions**

K. Yang, D. Shahar, R.N. Bhatt, D.C. Tsui, and M. Shayegan, *J. Phys.: Condens. Matter 12*, **5343** (2000).

**Topographic Mapping of the Quantum Hall Liquid Using a Few-electron Bubble**

G. Finkelstein, P. I. Glicofridis, R.C. Ashoori, and M. Shayegan, *Science* **289**, 90-94 (2000).

**Confinement Symmetry,
Mobility Anisotropy, and Metallic Behavior in (311)A GaAs 2D Holes**

S. J. Papadakis, E. P. De Poortere, and M. Shayegan, *Phys. Rev. B* **62**, 15375 (2000).

**Anisotropic Magnetoresistance
of Two-dimensional Holes in GaAs**

S. J. Papadakis, E. P. De Poortere, M. Shayegan, R. Winkler, *Phys.
Rev. Lett.* **84**, 5592 (2000).

**Parallel Magnetic
Field Induced Transition in Transport in the Dilute Two-dimensional Hole
System in GaAs**

J. Yoon, C.C. Li, D. Shahar, D.C. Tsui, and M. Shayegan, *Phys. Rev.
Lett.* **84**, 4421 (2000).

**Anisotropic Transport
of Two-Dimensional Holes in High Landau Levels**

M. Shayegan, H. C. Manoharan, S. J. Papadakis, and E. P. De Poortere,
*Physica E* **6**, 40 (2000).

**Microwave Resonance
and Weak Pinning in Two-dimensional Hole Systems at High Magnetic Field**

C. C. Li, J. Yoon, L.W. Engel, D. Shahar, D. C. Tsui, and M. Shayegan,
*Phys. Rev. B* **61**, 10905 (2000).

**Large Skyrmions
in an Al _{0.13}Ga_{0.87}As Quantum Well**

S. P. Shukla, M. Shayegan, S. R. Parihar, S. A. Lyon, N. R. Cooper, and A. A. Kiselev,

*Phys. Rev. B*

**61**, 4469 (2000).

**Anomalous Magneto-oscillations
in Two-dimensional Systems**

R. Winkler, S. J. Papadakis, E. P. De Poortere, and M. Shayegan, *Phys.
Rev. Lett.* **84**, 713 (2000).

**NMR Determination
of 2D Electron Spin Polarization at ? = 1/2**

S. Melinte, N. Freytag, M. Horvatic, C. Berthier, L. P. Levy, V. Bayot,
and M. Shayegan, *Phys. Rev. Lett.* **84**, 354 (2000).

## 1999

**Reply to Comment on Magnetic Field Induced Triple Layer to Bilayer
Transition**

S. P. Shukla, M. Shayegan, T. Jungwirth, and A. H. MacDonald, *Phys.
Rev. Lett.* **82**, 3724 (1999).

**Electrons in a Flatland**

M. Shayegan, review article in 1998 Les Houches Summer School, Session
LXIX, Topological Aspects of Low Dimensional Systems, NATO Advanced Study
Institute, edited by A. Comtet, T. Jolicoeur, S. Ouvry, and F. David,
(Springer-Verlag, Berlin, 1999), pp. 1-51.

**The Effect of
Spin Splitting on the Metallic Behavior of a Two-Dimensional System**

S. J. Papadakis, E. P. De Poortere, H. C. Manoharan, M. Shayegan, and
R. Winkler, *Science* **283**, 2056 (1999).

**Semicircle: An
Exact Relation in the Integer and Fractional Quantum Hall Effect**

M. Hilke, D. Shahar, S. H. Song, D. C. Tsui, Y. H. Xie, and M. Shayegan,
*Europhys. Lett.* **46**, 775 (1999).

**Spin-resolved Commensurability Oscillations**

J. P. Lu, M. Shayegan, L. Wissinger, U. Rossler, and R. Winkler, *Phys.
Rev. B* **60**, 13776 (1999).

**Heat Capacity
Evidence for the Suppression of Skyrmions at Large Zeeman Energy**

S. Melinte, E. Grivei, V. Bayot, and M. Shayegan, *Phys. Rev. Lett.*
**82**, 2764 (1999).

**Wigner Crystallization
and Metal-insulator Transition of Two-dimensional Holes in GaAs/AlGaAs
at B = 0**

J. Yoon, C.C. Li, D. Shahar, D.C. Tsui, and M. Shayegan, *Phys. Rev.
Lett.* **82**, 1744 (1999).

**Anomalous Spin-splitting
of Two-dimensional Electrons in an AlAs Quantum Well**

S. J. Papadakis, E. P. De Poortere, and M. Shayegan, *Phys. Rev. B* **59**,
R12743 (1999).

**Observation of
Quantum Fluctuations of Charge on a Quantum Dot**

D. Berman, N.B. Zhitenev, R.C. Ashoori, and M. Shayegan, *Phys. Rev.
Lett.* **82**, 161 (1999).

## 1998

**Magnetic Anisotropy
in Quantum Hall Ferromagnets**

T. Jungwirth, S. P. Shukla, L. Smrcka, M. Shayegan, and A. H. MacDonald,
*Phys. Rev. Lett.* **81**, 2328 (1998).

**Tunable Spin-splitting and Spin-resolved Ballistic Transport in GaAs/AlGaAs
Two-dimensional Holes**

J. P. Lu, J. B. Yau, S. P. Shukla, M. Shayegan, L. Wissinger, U. Rossler,
and R. Winkler, *Phys. Rev. Lett.* **81**, 1282 (1998).

**Ballistic Transport in a Two-subband Two-dimensional Electron System**

J. P. Lu and M. Shayegan, *Phys. Rev. B* **58**, 1138 (1998).

**Apparent Metallic
Behavior at B = 0 of a Two-dimensional Electron System in AlAs**

S. J. Papadakis and M. Shayegan, *Phys. Rev. B* **57** (Rapid Commun.),
R15068 (1998).

**Magnetic-Field-Induced Triple-layer to Bilayer Transition**

S. P. Shukla, Y. W. Suen, and M. Shayegan, *Phys. Rev. Lett.* **81**,
693 (1998).

## 1997

**Spontaneous
Interlayer Charge Transfer near the Magnetic Quantum Limit**

H. C. Manoharan, Y. W. Suen, T. S. Lay, M. B. Santos, and M. Shayegan,
*Phys. Rev. Lett.* **79** 2722 (1997).

**Critical Behavior
of Nuclear-spin Diffusion in GaAs/AlGaAs Heterostructures near Landau Level
Filling = 1**

V. Bayot, E. Grivei, J.-M. Beuken, S. Melinte, and M. Shayegan, *Phys.
Rev. Lett.* **79**, 1718 (1997).

**Resistance Oscillation in Wide Single Quantum Wells Subject to In-plane
Magnetic Fields**

T. Jungwirth, T. S. Lay, L. Smrcka, and M. Shayegan, *Phys. Rev. B* **56**,
1029 (1997).

**One-component to Two-component Transition of the ? = 2/3
Fractional Quantum Hall Effect in a Wide Quantum Well Induced by Tilted
Magnetic Fields**

T.S. Lay, T. Jungwirth, L. Smrcka, and M. Shayegan, *Phys. Rev.
B* **56**, R7092 (1997).

**Interlayer Charge Transfer in Double-quantum-well Systems**

S. J. Papadakis, J. P. Lu, M. Shayegan, S. R. Parihar, and S. A. Lyon,
*Phys. Rev. B* **55**, 9294 (1997).

**Microwave Conductivity Resonance of Two-dimensional Hole Systems**

C-C. Li, L. W. Engel, D. Shahar, D. C. Tsui, and M. Shayegan, *Phys.
Rev. Lett.* **79**, 1353 (1997).

**A Different View
of the Quantum Hall Plateau-to-Plateau Transitions**

D. Shahar, D. C. Tsui, M. Shayegan, E. Shimshoni, and S. L. Sondhi,
*Phys. Rev. Lett.* **79**, 479 (1997).

**Microwave Resonances in Low-filling Insulating Phase of Two-dimensional
Electron Systems**

L.W. Engel, C-C. Li, D. Shahar, D. C. Tsui, and M. Shayegan, *Solid
State Commun.* **104**, 167 (1997).

**The Nature of
the Hall Insulator**

D. Shahar, D.C. Tsui, M. Shayegan, J.E. Cunningham, E. Shimshomi, and
S.L. Sondhi, *Solid State Commun.* **102**, 817-821 (1997).

## 1996

**Correlated Bilayer Electron States**

M. Shayegan, H. C. Manoharan, Y. W. Suen, T.
S. Lay, and M. B. Santos, (invited) *Semicond. Sci. Technol. B* **11**,
1539 (1996).

**Evidence for a
Bilayer Quantum Wigner Solid**

H. C. Manoharan, Y. W. Suen, M. B. Santos, and M. Shayegan, *Phys. Rev.
Lett.* **77,** 1813 (1996).

**Phonon Emission
from a 2D Electron Gas: Evidence of Transition to the Hydrodynamic Regime**

E. Chow, H. P. Wei, S. M. Girvin, and M. Shayegan, *Phys. Rev. Lett.*
**77**, 1143 (1996).

**Giant Low Temperature
Heat Capacity of GaAs Quantum Wells near Landau Level Filling ? = 1**

V. Bayot, E. Grivei, S. Melinte, M. B. Santos, and M. Shayegan, *Phys.
Rev. Lett.* **76**, 4584 (1996).

**Inductive Anomaly of Two-dimensional Electrons in the Wigner Solid
Regime**

Y-P. Li, D. C. Tsui, L. W. Engel, M. B. Santos, and M. Shayegan, *Solid
State Commun.* **99**, 255 (1996).

**Electronic Properties of GaAs/AlGaAs-Based Modulation Doped Heterojunctions,
Quantum Wells, and Superlattices**

M. Shayegan, review article in *Properties of III-V Superlattices and
Quantum Wells*, edited by P.K. Bhattacharya (Institution of Electrical Engineers,
United Kingdom, 1996), pp. 297-303.

**Case for Magnetic Field Induced 2D Wigner Crystal**

M. Shayegan, book chapter in *Perspectives in Quantum Hall Effects:
Novel Quantum Liquids in Low-dimensional Semiconductor Structures*, edited
by S. Das Sarma and A. Pinczuk (Wiley, New York, 1996), pp. 343-384.

**Evidence for Charge-flux
Duality near the Quantum Hall Liquid to Insulator Transition**

D. Shahar, D. C. Tsui, M. Shayegan, E. Shimshoni, and S. L. Sondhi,
*Science* **274**, 589 (1996).

**Observation of Ballistic Transport in the Upper Subband of a Two-dimensional
Electron System**

J-P. Lu and M. Shayegan, *Phys. Rev. B* **53** (Rapid Commun.), R4217
(1996).

**Novel Cleaved Edge Overgrowth Structures for Tunneling into One-
and Two-dimensional Electron Systems**

M. Grayson, C. Kurdak, D. C. Tsui, S. R. Parihar, S. A. Lyon, and M.
Shayegan, *Solid State Electronics* **40**, 233 (1996).

## 1995

**Far Infrared Emission from Hot Quasi One Dimensional Quantum
Wires in GaAs**

M. Grayson, D.C. Tsui, M. Shayegan, K. Hirakawa, R.A. Ghanbari, and
H.I. Smith, *Appl. Phys. Lett.* **67**, 1564 (1995).

**Quantitative Determination of Many-body-induced Interlayer Charge
Transfer in Bilayer Electron Systems via Subnikov-de Haas Measurements**

X. Ying, S. R. Parihar, H. C. Manoharan, and M. Shayegan, *Phys. Rev.
B* **52** (Rapid Commun.), 11611 (1995).

**RF Resonance in Two-dimensional Electron Transport in the Wigner
Solid Regime**

Y. P. Li, D. C. Tsui, L. W. Engel, M. B. Santos, T. Sajoto, and M.
Shayegan, *Solid State Commun.* **96**, 379 (1995).

**Thermopower of Composite Fermions**

V. Bayot, E. Grivei, H. C. Manoharan, X. Ying, and M. Shayegan, *Phys.
Rev. B* **52** (Rapid Commun.), 8621 (1995).

**Layer-depopulation- and Magnetic-field-induced Resistance Oscillations
in a Triple-layer Electron System**

T. S. Lay, X. Ying, and M. Shayegan, *Phys. Rev. B* **52** (Rapid
Commun.), 5511 (1995).

**Charge Transfer at Double-layer to Single-layer Transition in Double
Quantum Well Systems**

Y. Katayama, D. C. Tsui, H. C. Manoharan, S. Parihar, and M. Shayegan,
*Phys. Rev. B* **52**, 14817 (1995).

**Universal Conductivity at the Quantum Hall Liquid to Insulator Transition**

D. Shahar, D. C. Tsui, M. Shayegan, R. N. Bhatt, and J. E. Cunningham,
*Phys. Rev. Lett.* **74**, 4511 (1995).

**Time-resolved Photoluminescence of a Two-dimensional Hole System
in the Extreme Quantum Limit**

L. V. Kulik, V. T. Dologopolov, A. A. Shashkin, A. F. Dite, L. V. Butov,
V. D. Kulakovskii, H. C. Manoharan, and M. Shayegan, *Phys. Rev. B* **51**
(Rapid Commun.), 13876 (1995).

**Grating-induced Cyclotron Resonance Anomaly in GaAs/AlGaAs Heterostructures**

Y. Zhao, D. C. Tsui, M. B. Santos, M. Shayegan, R. A. Ghanbari, D.
A. Antoniadis, and H. I. Smith, *Phys. Rev. B* **51**, 13174 (1995).

**Electron Temperature in Low-dimensional Wires Using Thermal Noise
Measurements**

C. Kurdak, D. C. Tsui, S. Parihar, S. A. Lyon, and M. Shayegan, *Appl.
Phys. Lett.* **67**, 386 (1995).

**High Field Transport in an Edge Overgrown Lateral Superlattice**

C. Kurdak, A. Zaslavsky, D.C. Tsui, M.B. Santos, and M. Shayegan, *Appl.
Phys. Lett.* **66**, 323 (1995).

**Observation of a Giant Dielectric Constant in the Re-entrant Insulating
Phase of Two-dimensional Electrons**

Y. P. Li, D. C. Tsui, T. Sajoto, L. W. Engel, M. Santos, and M. Shayegan,
*Solid State Commun.* **95**, 619 (1995).

## 1994

**Anomalous Temperature Dependence of Correlated ? = 1
Quantum Hall Effect in Bilayer Electron Systems**

T. S. Lay, Y. W. Suen, H. C. Manoharan, X. Ying, M. B. Santos, and
M. Shayegan, *Phys. Rev. B* **50** (Rapid Commun.), 17725 (1994).

**Observation of Composite-Fermion Thermopower at Half-filled Landau
Levels**

X. Ying, V. Bayot, M. B. Santos, and M. Shayegan, *Phys. Rev. B* **50**
(Rapid Commun.), 4969 (1994).

**Novel Surface Gate Structure to Induce Sharp Potential Barriers in
Two-dimensional Electron Systems**

J. P. Lu, X. Ying, and M. Shayegan, *Appl. Phys. Lett.* **65**, 2320
(1994).

**Signatures of a Novel Fermi Liquid in a Two-dimensional Composite
Particle Metal**

H. C. Manoharan, M. Shayegan, and S. J. Klepper, *Phys. Rev. Lett.* **73**,
3270 (1994).

**Magnetic Field Symmetry Properties of the Capacitance Tensor of a
Two-dimensional Electron System**

W. Chen, T. P. Smith III, M. Buttiker, and M. Shayegan, *Phys. Rev.
Lett.* **73**, 146 (1994).

**Quantum Reflection and Transmission of Ballistic Two-dimensional
Electrons by a Potential Barrier**

X. Ying, J. P. Lu, J. J. Heremans, M. B. Santos, M. Shayegan, S. A.
Lyon, M. Littman, P. Gross, and H. Rabitz, *Appl. Phys. Lett.* **65**,
1154 (1994).

**Wigner Crystal vs. Hall Insulator**

H. C. Manoharan and M. Shayegan, *Phys. Rev. B* **50**, 17662 (1994).

**Magneto-optics of Two-dimensional Hole Systems in the Extreme Quantum
Limit**

L. V. Butov, A. Zrenner, M. Shayegan, G. Abstreiter, and H. C. Manoharan,
*Phys. Rev. B* **49** (Rapid Commun.), 14054 (1994).

**Origin of the ? = 1/2 Fractional Quantum Hall State in Wide
Single Quantum Wells**

Y. W. Suen, H. C. Manoharan, X. Ying, M. B. Santos, and M. Shayegan,
*Phys. Rev. Lett.* **72**, 3405 (1994).

**Charge Transport in a Low-disorder, Low-density One-dimensional Electron
System**

S. W. Hwang, D. C. Tsui, and M. Shayegan, *Phys. Rev. B* **49**, 16441
(1994).

**Optimally Designed Potentials for Control of Electron Wave Scattering
in Semiconductor Nano-devices**

P. Gross, V. Ramakrishna, E. Vilallonga, H. Rabitz, M. Littman, S.
A. Lyon, and M. Shayegan, *Phys. Rev. B* **49**, 11100 (1994).

**Mobility Anisotropy of Two-dimensional Hole Systems in (311)A GaAs/AlGaAs
Heterojunctions**

J. J. Heremans, M. B. Santos, K. Hirakawa, and M. Shayegan, *J. Appl.
Phys.* **76**, 1980 (1994).

**Thermopower Measurements in the Reentrant Insulating Phase of a Two-dimensional
Hole System**

V. Bayot, X. Ying, M. B. Santos, and M. Shayegan, *Europhysics Letters*
**25**, 613 (1994).

**Experimental Study of \sigma_xx(T) for Quasiparticle Charge Determination
in Fractional Quantum Hall Effect**

Y. Katayama, D. C. Tsui, and M. Shayegan, *Phys. Rev. B ***49**, 7400
(1994).

**Surface Resonant Tunneling Transistor: A New Negative Trans-conductance
Device**

C. Kurdak, D. C. Tsui, S. Parihar, M. B. Santos, H. C. Manoharan, S.
A. Lyon, and M. Shayegan, *Appl. Phys. Lett. ***64**, 610 (1994).