Group Meetings Schedule 2021

Jan 20 (skipped due to Visa emergence), Haiping Hu, Wednesday 7:00 pm pitt time (Jan 21, 8:00 am Beijing time)

Jan 27, Zehan Li (rehearsal for defense), Wednesday 7:00 pm pitt time (Jan 28, 8:00 am Beijing time)

Feb 3, Haiping Hu, Exceptional Topological Insulator, Wednesday 7:00 pm pitt time (Feb 03, 8:00 am Beijing time)

Feb 17, Sayan Choudhury Prethermal Discrete Time Crystals Wednesday 7:00 pm pitt time (Feb 18, 8:00 am Beijing time)

March 10, Yang Ge (Postdoc Candidate) Wednesday 7:00 pm pitt time (March 11, 8:00 am Beijing time)

Title: Universal Landau-Zener regimes in dynamical topological phase transitions

Abstract: Topological quantum matters display fascinating response properties and robust edge states that put them at the center of continuous research. Generation, control and manipulation of topological matter proves to be a colorful theoretical playground and has become attainable in ultracold atom and condensed matter platforms in recent years. In this talk, I will discuss the dynamical preparation of the topological state of Floquet Chern insulators. I will show how a no-go theorem forbids transition between difference Chern insulator phases under unitary dynamics. In finite size systems, however, a topological phase transition can occur dynamically. Of the three regimes that the dynamics across these phase transitions falls into, we found that a universal Landau-Zener regime governs the behavior of dynamical topological phase transitions.

Daylight Saving Time Begins

March 17, Han Fu (Postdoc Candidate) 8:00 pm Pitt Time (March 18, 8:00 am Beijing time)

Title: Nonequilibrium dynamics in driven ultracold Bose systems and electron transport in disordered semiconductor systems

March 24, Zi-Yong Ge (Postdoc Candidate) 8:00 pm pitt time (March 25, 8:00 am Beijing time)

Title: Quantum simulation on superconducting circuits

Abstract: Superconducting circuits (SCCs) are believed to be one of the most competitive candidates for achieving the universal quantum computation and performing quantum simulation, due to the scalability, long coherent time, and high-precision control. In this talk, I will discuss my recent research progresses about quantum simulation via SCCs. Firstly, I will give a brief introduction of superconducting qubits. Then, I will discuss my two works about quantum simulation on SCCs in detail. One is the dynamics of Bose-Hubbard ladder model, where we find that there exists interesting pair localization. The other is how to simulate a Z2 lattice gauge theory on an 1D SCC. Finally, I will shortly introduce the ongoing quantum-simulation works I involved, and outline my future plans about the academic research

March 31, Grigory Bednik (Postdoc Candidate) 8:00 pm pitt time (April 1, 8:00 am Beijing time)

Title: Novel transport properties in topological semimetals at high magnetic fields

Abstract: Topological semimetals are characterized by unconventional electronic structure which leads to novel transport properties. In this talk I would like to discuss a few examples of such properties at high magnetic fields. In particular I discuss magnetoresistance of Weyl semimetals, its drag viscosity, second order response and thermopower. Also I consider nodal line semimetals and discuss their thermopower and neutron response. If time remains, I also would like to discuss my past work on surface states and antiferromagnetism in Dirac semimetals.

April 7, Bhaskar Mukherjee Wednesday 8:00 pm pitt time (April 8, 8:00 am Beijing time)

April 21, Zijian Wang Wednesday 8:00 pm Pitt time (April 22, 8:00 am Beijing time)

May 5, Haiping Hu Wednesday 8:00 pm Pitt time (May 6, 8:00 am Beijing time)

May 26, Sayan Choudhury Wednesday 8:00 pm Pitt time (May 27, 8:00 am Beijing time)

June 23, Sayan Choudhury Wednesday 8:00 pm Pitt time (June 24, 8:00 am Beijing time)

June 30, Sayan Choudhury Wednesday 8:00 pm Pitt time (July 1, 8:00 am Beijing time)

July 7, Yucheng Wang Wednesday 8:00 pm Pitt time (July 8, 8:00 am Beijing time)

Title: Mobility edges and critical phases in one-dimensional quasiperiodic systems.

July 28, Zijian Wang Wednesday 8:00 pm Pitt time (July 29, 8:00 am Beijing time)

August 25, Haiping Hu Wednesday 8:00 pm Pitt time (August 26, 8:00 am Beijing time)