Slow thermalization between a lattice and free Bose gas

David C. McKay, Carolyn Meldgin, David Chen, Brian Demarco

Research output: Contribution to journalArticlepeer-review


Using a 3D spin-dependent optical lattice, we study thermalization and energy exchange between two ultracold Bose gases, one of which is strongly correlated and bound to the lattice and another that is free from the lattice potential. Disruption of interspecies thermalization is revealed through measurements of condensate fraction after the lattice is superimposed on the parabolic confining potential. By selectively heating the lattice-bound species and measuring the rate of heat transfer to the free state, suppression of energy exchange is observed. Comparison with a Fermi's golden rule prediction confirms that this effect is caused by a dispersion mismatch that reduces the phase space available for elastic collisions. This result has critical implications for methods proposed to cool strongly correlated lattice gases.

Original languageEnglish (US)
Article number063002
JournalPhysical review letters
Issue number6
StatePublished - Aug 8 2013

ASJC Scopus subject areas

  • General Physics and Astronomy


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