IQIM Postdoctoral and Graduate Student Seminar

Friday June 17, 2016 4:00 PM

Anomalous Floquet-Anderson Insulator as a Nonadiabatic Quantized Charge Pump

Speaker: Paraj Titum Bhattacharjee
Location: East Bridge 114

Abstract: We show that two-dimensional periodically driven quantum systems with spatial disorder admit a unique topological phase, which we call the anomalous Floquet-Anderson insulator (AFAI). The AFAI is characterized by a quasienergy spectrum featuring chiral edge modes coexisting with a fully localized bulk. Such a spectrum is impossible for a time-independent, local Hamiltonian. These unique characteristics of the AFAI give rise to a new topologically protected nonequilibrium transport phenomenon: quantized, yet nonadiabatic, charge pumping. We distinguish the AFAI from a trivial, fully localized phase, and show that the two phases are separated by a phase transition.


 

 

Series IQIM Postdoctoral and Graduate Student Seminar Series

Contact: Marcia Brown at 626-395-4013 marciab@caltech.edu