Robertson, Andrew and Galitski, Victor M. and Refael, Gil (2011) Dynamic Stimulation of Quantum Coherence in Systems of Lattice Bosons. Physical Review Letters, 106 (16). Art. No. 165701. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110523-102744616
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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 nonequilibrium 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 nonequilibrium spatial correlation function with periodic driving. We show that the nonequilibrium 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.
|Additional Information:||© 2011 American Physical Society. Received 29 November 2010; revised 10 February 2011; published 20 April 2011. The authors are grateful to Ehud Altman, William Phillips, and Hong Ling for illuminating discussions of this topic. This research was supported by JQI-PFC (A. R.), DARPA and U.S.-ARO (V. G.), and the Packard Foundation, Sloan Foundation, and NSF Grants No. PHY- 0456720 and No. PHY-0803371 (G. R.).|
|Classification Code:||PACS: 67.85.-d, 03.75.Kk, 03.75.Lm, 64.60.Ht|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||24 May 2011 14:45|
|Last Modified:||26 Dec 2012 13:15|
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