Insights into the Nature of the Even Denominator States and Bubble Phases forming in the Second Landau Level
Speaker: Dr. Gabor A. Csathy, Purdue University
Series: Topical Seminars
Location:
B418
Date/Time: Tuesday, January 17, 2012, 11:00 a.m.
- 12:00 p.m.
Abstract:
Ground states developing in a two-dimensional electron gas in the second Landau level appear to be different from those of the lowest Landau level and continue to challenge our understanding. In the first part of my talk I will focus on the even denominator states as measured for the first time in the new regime of very low densities and in samples grown in different MBE chambers. I will discuss the strengths and deficiencies of various methods used to compare experimental and theoretical gaps and argue that our analysis lends a strong support to the Pfaffian description of these states. In the second half of my talk I will discuss the reentrant insulating states believed to be electronic bubble phases. We find an anomalous temperature dependent magnetoresistance which we use to define the onset temperature of these states. We find that the onset temperatures in the second and third Landau level are not consistent with current theoretical results.
Biography:
Purdue University, Assistant Professor of Physics since 2006
Princeton University Postdoctoral /ElectricalEngineering 2001-2006
The Pennsylvania State University PhD, Physics 2001
University of Bucharest, Romania BS, Physics 1994
