Caltech Logo

IQIM Postdoctoral and Graduate Student Seminar

Friday, June 17, 2016
4:00pm to 5:00pm
Add to Cal
East Bridge 114
Anomalous Floquet-Anderson Insulator as a Nonadiabatic Quantized Charge Pump
Paraj Titum Bhattacharjee, Graduate Student, Refael Group,

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.



For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at [email protected].