## Colloquium

Thursday, February 6, 2014

**Philip W. Anderson,** Princeton University

**"The Discovery of the Anderson-Higgs Mechanism"**

**Ali Yazdani**, Department of Physics, Princeton University

Thursday, February 13, 2014//Rescheduled for Friday, February 14th Noon - PCTS

**Gabriel Orebi Gann**, UC-Berkeley

**"Here Be Dragons: Mysteries of the Neutrino"**

**Chris Tully**, Princeton University

Thursday, February 20, 2014

**Jun Ye,** University of Colorado

**"Ultracold Molecules - New Frontiers in Quantum and Chemical Physics"**

Molecules cooled to ultralow temperatures provide fundamental new insights to molecular interaction dynamics in the quantum regime. In recent years, researchers from various scientific disciplines such as atomic, optical, condensed matter physics, physical chemistry, and quantum science have started working together to explore many emergent topics related to cold molecules, including cold chemistry, strongly correlated quantum systems, novel quantum phases, and precision measurement.

Complete control of molecular interactions by producing a molecular gas at very low entropy and near absolute zero has long been hindered by their complex energy level structure. Recently, a range of technical tools have been developed enabling the production of ultracold molecules, including a quantum gas of molecules. In this regime, molecular collisions follow full quantum descriptions. Chemical reaction is controlled via quantum statistics of the molecules, along with dipolar effects. Further, molecules can be confined in reduced spatial dimensions and their interactions are precisely manipulated via external electromagnetic fields. By encoding a spin-1/2 system in rotational states, we realize a spin lattice system where many-body spin dynamics are directly controlled by long-range and anisotropic dipolar interactions. These new capabilities promise further explorations of strongly interacting and collective quantum effects in exotic quantum matter."

Host: **Waseem Bakr**, Princeton University

Thursday, February 27, 2014

**Stanislas Leibler**, The Rockefeller University; IAS

**"Ethology and Ecology of Simple Microbial Systems"**

I will describe two recent experiments on simple microbial systems. In particular, in these experiments an effort has been made to develop a statistical description of the dynamics on different time scales, ranging from minutes to months. In this way I hope to illustrate some major difficulties connected with building an appropriate quantitative framework for even the simplest biological phenomena.

(This talk will be 99% DNA free.)

Host:** David Huse**, Princeton University

Thursday, March 6, 2014

**Michael Peskin**, SLAC National Accelerator Laboratory, Stanford University

**“Beyond the Higgs Boson: Further questions and expectations for the Large Hadron Collider”**

The biggest recent news from particle physics is the discovery at the CERN Large Hadron Collider of a new particle with many properties of the long-sought Higgs Boson. The Higgs Boson had been predicted by the unified theory of weak and electromagnetic interactions. This discovery thus seems to fill a recognized gap in our understanding. But there are more mysteries about the weak interactions and physics at the 100 GeV - 1 TeV mass scale. About these, the LHC has also given us much information, but all of it negative, exclusions of previously possible solutions.

In this lecture I will give my best understanding of where we are in the search for new particles and forces related to the weak interactions. I will review the questions we are asking about physics in the hundred GeV region. I will discuss the power and also the difficulties of LHC measurements. There are many alternatives for the route forward. I will discuss some of these and their implications for the future program of physics at high-energy colliders.

Host: **Mariangela Lisanti**, Princeton University

Thursday, March 27, 2014

**Matthias Troyer**, ETH Zurich

**"Validating Quantum Devices"**

About a century after the development of quantum mechanics we have now reached an exciting time where non-trivial devices that make use of quantum effects can be built. While a universal quantum computer of non-trivial size is still out of reach, there are a number of commercial and experimental devices: quantum random number generators, quantum encryption systems, and analog quantum simulators.

Host: **Ali Yazdani**, Princeton University

**** Hamilton Lecture ** **

8 p.m. Thursday, April 3, 2014

**McDonnell Hall, A02**

8 p.m. Thursday, April 3, 2014

**Samuel Ting, **MIT

**"The Latest Results from the Alpha Magnetic Spectrometer on the International Space Station"
**

The Alpha Magnetic Spectrometer (AMS) is a multipurpose particle physics detector that was installed on the International Space Station in May 2011. More than 50 billion cosmic ray events have been collected. The latest findings will be presented.

**Stewart Smith**, Princeton University

Thursday, April 10, 2014

**Mikhail Lukin,** Harvard University

**"Quantum Dynamics of Strongly Interacting Systems"**

We will discuss recent developments at a new scientific interface involving quantum many-body dynamics of strongly interacting systems. Combining advances in several sub-fields of physical science, this research is aimed at realizing new states of matter that can exist far from equilibrium, and exploring novel science and applications of such states. Two specific example systems include strongly interacting optical photons and disordered spin ensembles. We will discuss how these systems can be used for creating photonic molecules, exploring many-body localization, and investigating unique new applications.

Host: **Ali Yazdani**, Princeton University

Thursday, April 17, 2014

**Yayu Wang,** Tsinghua University

**" Quantum Anomalous Hall Effect in Topological Insulators"**

The anomalous Hall effect was discovered more than 130 years ago in a ferromagnet, where a Hall resistance exists even in the absence of external magnetic field. The quantized version of the anomalous Hall effect has attracted much interest since the discovery of the quantum Hall effect in the 1980s. A few years ago, it was proposed that a quantum anomalous Hall effect may occur in magnetic topological insulators, but the experimental realization has been elusive. In this talk we will report transport studies of magnetically doped topological insulator thin films grown by molecular beam epitaxy. We have achieved systematic tuning of the electronic band structure, magnetic ordering, and bulk band topology, which eventually led to the experimental realization of the quantum anomalous Hall effect, i.e., the quantum Hall effect in zero magnetic field.

*Science*__340__, 167 (2013).

Host: **Phuan Ong**, Princeton University

Thursday, May 1, 2014

Speaker: **Matthew P.A. Fisher**, UC-Santa Barbara

"**Quantum Tapestries**"

Within each of nature’s crystals is an exotic quantum world of electrons weaving to and fro. Each crystal has its own unique tapestry, as varied as the crystals themselves. In some crystals the electrons weave an orderly quilt. Within others, the electrons are seemingly entwined in a entangled web of quantum motion. In this talk I will describe the ongoing efforts to disentangle even nature’s most intricate quantum embroidery. Cutting-edge quantum many-body simulations together with recent ideas from quantum information theory, such as entanglement entropy, are enabling a coherent picture to emerge.

Host: **Ali Yazdani**, Princeton University