期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.175301
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资金
- Deutsche Forschungsgemeinschaft (DFG) [FOR 801]
- EU
- National Science Foundation [PHYS-1066293]
- Alexander von Humboldt Foundation
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 +/-(pi/2)((h) over bar /d) in the momentum distribution function.
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