Bio
What is the nature of topological phenomena in condensed matter physics and quantum entanglement?
Topological phenomena are the phenomena which are determined by some topological structure in the physical system, which are thus usually universal and robust against perturbations. For example, two famous topological phenomena are the flux quantization in superconductors and Hall conductance quantization in the Quantum Hall states. Recent discovery of topological insulators and topological superconductors in different symmetry classes bring the opportunty to study a large family of new topological phenomena. For example, the threedimensional topological insulator provides a condensed matter realization of the important theoritical concepts on high energy physics such as the "thetavacuum" and "axion". The interplay of topological insulators and superconductors with conventional phases of matter such as ferromagnets and superconductors lead to richer topological phenomena.
Quantum entanglement is the unique feature of quantum mechanics, which is essential for quantum information and quantum computation. The understanding of quantum entanglement provides a new probe to the physical properties of the manybody systemscompared to the conventional response properties such as conductivity, spin susceptibility, etc. On the other hand, more systematical understanding of quantum entanglement in manybody systems compared to fewbody systems. There are alot of open questions for which the answer is not known or only known for specific systems. For example what is the general relation between entanglement properties and other physical observables in a given system? What is the general relation between quantum entanglement and topological states of matter? Besides the known description of entanglement such as von Neumann entropy, what other measure can be defined to provide more refined characterization of entanglement?
Administrative Appointments

Associate Professor, Physics, Stanford University (2014  Present)

Assistant Professor, Physics, Stanford University (2009  2014)

Postdoctoral Researcher, Microsoft Station Q, UC Santa Barbara (2009  2010)

Research Associate, Stanford Linear Accelerator Center (2007  2009)
Honors & Awards

The New Horizons in Physics Prize, The Breakthrough Prize Foundation (2015)

Sackler International Prize, Physics, Raymond and Beverly Sackler, Tel Aviv University (2014)

Hermann Kummel Early Achievement Award, in ManyBody Physics, International Conference Advisory Committee (2011)

Packard Fellowship, David and Lucile Packard Foundation (2011)

Sloan Fellowship, Sloan Foundation (2010)
Professional Education

Ph.D., Institute for Advanced Study, Tsinghua University, Physics (2007)

B.S., Tsinghua University, Physics (2003)
201718 Courses
 Condensed Matter Theory II
PHYSICS 373 (Spr) 
Independent Studies (2)
 Research
PHYSICS 490 (Aut, Win, Spr, Sum)  Senior Thesis Research
PHYSICS 205 (Win, Spr)
 Research

Prior Year Courses
201617 Courses
 Condensed Matter Theory II
PHYSICS 373 (Spr)  Topics in Modern Condensed Matter Theory I: Topological States of Matter
PHYSICS 470 (Aut)
201516 Courses
 Condensed Matter Theory II
PHYSICS 373 (Spr)
201415 Courses
 Advanced Mechanics
PHYSICS 110, PHYSICS 210 (Aut)  Condensed Matter Theory II
PHYSICS 373 (Spr)
 Condensed Matter Theory II