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.

Audience: Clark School  All Students  Graduate  Undergraduate  Faculty  Staff 

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