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arXiv · 1505.05150

Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta

L. Vidmar·J. P. Ronzheimer·M. Schreiber·S. Braun·S. S. Hodgman·S. Langer·F. Heidrich-Meisner·I. Bloch·U. Schneider
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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 $\pm (\pi/2) (\hbar / d)$ in the momentum distribution function.

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L. Vidmar, J. P. Ronzheimer, M. Schreiber, S. Braun, S. S. Hodgman, S. Langer, F. Heidrich-Meisner, I. Bloch, U. Schneider. 2015-05-19. Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta. https://doi.org/10.1103/physrevlett.115.175301

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