Floquet dynamical quantum phase transitions
Abstract
Dynamical quantum phase transitions (DQPTs) are manifested by time-domain nonanalytic behaviors of many-body systems.Introducing a quench is so far understood as a typical scenario to induce DQPTs.In this work, we discover a novel type of DQPTs, termed "Floquet DQPTs", as intrinsic features of systems with periodic time modulation.Floquet DQPTs occur within each period of continuous driving, without the need for any quenches.In particular, in a harmonically driven spin chain model, we find analytically the existence of Floquet DQPTs in and only in a parameter regime hosting a certain nontrivial Floquet topological phase. The Floquet DQPTs are further characterized by a dynamical topological invariant defined as the winding number of the Pancharatnam geometric phase versus quasimomentum.These findings are experimentally demonstrated with a single spin in diamond.This work thus opens a door for future studies of DQPTs in connection with topological matter.
Cite
@article{arxiv.1901.10365,
title = {Floquet dynamical quantum phase transitions},
author = {Kai Yang and Longwen Zhou and Wenchao Ma and Xi Kong and Pengfei Wang and Xi Qin and Xing Rong and Ya Wang and Fazhan Shi and Jiangbin Gong and Jiangfeng Du},
journal= {arXiv preprint arXiv:1901.10365},
year = {2019}
}