Event
Quantum Fridays Seminar Series: Zemin Huang, JQI
Friday, September 23, 2022
12:00 p.m.-1:00 p.m.
ATL 2324
Speaker: Zemin Huang, JQI
Title:
Topological gauge theory for mixed Dirac stationary states in all dimensions
Abstract:
Topological mixed quantum states in or out of equilibrium can arise in open quantum systems. Their linear responses are generally non-quantized, even though quantized topological invariants can be defined. In this talk, I will present a real-time U(1) topological gauge field action capable of reconciling this paradoxical phenomenology. In addition to non-quantized linear responses, this action encodes quantized non-linear responses associated with mixed state topology. Also, this construction demonstrates how the physical pictures of anomaly inflow and bulk-boundary correspondence extend to non-equilibrium systems.
Pizza and refreshments will be served after the talk.
