Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-11-09
Phys. Rev. Lett. 106, 165701 (2011)
Physics
Condensed Matter
Quantum Gases
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.106.165701
Thermal fluctuations tend to destroy long-range phase correlations. Consequently, bosons in a lattice will undergo a transition from a phase-coherent superfluid as the temperature rises. Contrary to common intuition, however, we show that non-equilibrium driving can be used to reverse this thermal decoherence. This is possible because the energy distribution at equilibrium is rarely optimal for the manifestation of a given quantum property. We demonstrate this in the Bose-Hubbard model by calculating the non-equilibrium spatial correlation function with periodic driving. We show that the non-equilibrium phase boundary between coherent and incoherent states at finite bath temperatures can be made qualitatively identical to the familiar zero-temperature phase diagram, and we discuss the experimental manifestation of this phenomenon in cold atoms.
Galitski Victor M.
Refael Gil
Robertson Andrew
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