title: Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta.
abstract: Long-range order in quantum many-body systems is usually associated with equilibrium situations. Here, we experimentally investigate the quasicondensation of strongly interacting bosons at finite momenta in a far-from-equilibrium case. We prepare an inhomogeneous initial state consisting of one-dimensional Mott insulators in the center of otherwise empty one-dimensional chains in an optical lattice with a lattice constant d. After suddenly quenching the trapping potential to zero, we observe the onset of coherence in spontaneously forming quasicondensates in the lattice. Remarkably, the emerging phase order differs from the ground-state order and is characterized by peaks at finite momenta ±(π/2)(ℏ/d) in the momentum distribution function.
authors.affiliation: Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Vidmar
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: J P
authors.initials: JP
authors.lastname: Ronzheimer
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Schreiber
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Braun
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: S S
authors.initials: SS
authors.lastname: Hodgman
authors.affiliation: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: S
authors.initials: S
authors.lastname: Langer
authors.affiliation: Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Heidrich-Meisner
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Bloch
authors.affiliation: Department of Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.|Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: U
authors.initials: U
authors.lastname: Schneider