2012/11/30 by David McKay, David C. McKay, Carolyn Meldgin +2
Physics and Astronomy · #Atomic physics #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Empty lattice approximation #Free space #Lattice (music) #Optical lattice #Optics #Particle in a one-dimensional lattice #Physics #Quantum many-body systems #Quantum mechanics #Quantum, superfluid, helium dynamics #Reciprocal lattice #Thermalisation #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.111.063002
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arxiv created 2013/07/27 · openalex publication_date 2013/08/08 · arxiv updated 2013/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.