title: Phase Structure of Driven Quantum Systems.
abstract: Clean and interacting periodically driven systems are believed to exhibit a single, trivial "infinite-temperature" Floquet-ergodic phase. In contrast, here we show that their disordered Floquet many-body localized counterparts can exhibit distinct ordered phases delineated by sharp transitions. Some of these are analogs of equilibrium states with broken symmetries and topological order, while others-genuinely new to the Floquet problem-are characterized by order and nontrivial periodic dynamics. We illustrate these ideas in driven spin chains with Ising symmetry.
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.|Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: Vedika
authors.initials: V
authors.lastname: Khemani
authors.affiliation: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: Achilleas
authors.initials: A
authors.lastname: Lazarides
authors.affiliation: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: Roderich
authors.initials: R
authors.lastname: Moessner
authors.affiliation: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.|Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: S L
authors.initials: SL
authors.lastname: Sondhi