Dissipative preparation of Chern insulators

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Jan Carl Budich - , University of Innsbruck (Author)
  • Peter Zoller - , University of Innsbruck, Austrian Academy of Sciences (Author)
  • Sebastian Diehl - , Institute of Theoretical Physics, University of Innsbruck, Austrian Academy of Sciences (Author)

Abstract

Engineered dissipation can be employed to prepare interesting quantum many-body states in a nonequilibrium fashion. The basic idea is to obtain the state of interest as the unique steady state of a quantum master equation, irrespective of the initial state. Due to a fundamental competition of topology and locality, the dissipative preparation of gapped topological phases with a nonvanishing Chern number has so far remained elusive. Here, we study the open quantum system dynamics of fermions on a two-dimensional lattice in the framework of a Lindblad master equation. In particular, we discover a mechanism to dissipatively prepare a topological steady state with nonzero Chern number by means of short-range system bath interaction. Quite remarkably, this gives rise to a stable topological phase in a nonequilibrium phase diagram. We demonstrate how our theoretical construction can be implemented in a microscopic model that is experimentally feasible with cold atoms in optical lattices.

Details

Original languageEnglish
Article number042117
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume91
Issue number4
Publication statusPublished - 14 Apr 2015
Peer-reviewedYes

Keywords