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Dynamics-induced freezing of strongly correlated ultracold bosons

Mondal, S. and Pekker, D. and Sengupta, K. (2012) Dynamics-induced freezing of strongly correlated ultracold bosons. Europhysics Letters, 100 (6). Art. No. 60007. ISSN 0295-5075. doi:10.1209/0295-5075/100/60007.

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We study the non-equilibrium dynamics of ultracold bosons in an optical lattice with a time-dependent hopping amplitude J(t) = J_0 + δJcos(ωt) which takes the system from a superfluid phase near the Mott-superfluid transition (J = J_0 + δJ) to a Mott phase (J = J_0 − δJ) and back through a quantum critical point (J = Jc), and demonstrate dynamics-induced freezing of the boson wave function at specific values of ω. At these values, the wave function overlap F (defect density P = 1 − F) approaches unity (zero). We provide a qualitative explanation of the freezing phenomenon, show its robustness against quantum fluctuations and the presence of a trap, compute residual energy and superfluid order parameter for such dynamics, and suggest experiments to test our theory.

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Additional Information:© 2012 EPLA. received 23 August 2012; accepted in final form 27 November 2012. published online 4 January 2013. SM and KS thanks K. Ray for several stimulating discussions. KS thanks DST for support through grant SR/S2/CMP-001/2009. DP acknowledges support from the Lee A. DuBridge fellowship.
Funding AgencyGrant Number
Lee A. DuBridge fellowshipUNSPECIFIED
Issue or Number:6
Classification Code:PACS: 05.30.Jp, 64.60.Ht, 05.30Rt
Record Number:CaltechAUTHORS:20130301-113858480
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Official Citation:Dynamics-induced freezing of strongly correlated ultracold bosons S. Mondal, D. Pekker and K. Sengupta doi:10.1209/0295-5075/100/60007
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37247
Deposited By: Ruth Sustaita
Deposited On:01 Mar 2013 21:02
Last Modified:09 Nov 2021 23:27

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