%0 Journal Article
%T Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta
%A L. Vidmar
%A J. P. Ronzheimer
%A M. Schreiber
%A S. Braun
%A S. S. Hodgman
%A S. Langer
%A F. Heidrich-Meisner
%A I. Bloch
%A U. Schneider
%J Physics
%D 2015
%I arXiv
%R 10.1103/PhysRevLett.115.175301
%X 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 $\pm (\pi/2) (\hbar / d)$ in the momentum distribution function.
%U http://arxiv.org/abs/1505.05150v2