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, 95 (4), 040403

Atomic Gases at Negative Kinetic Temperature

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Atomic Gases at Negative Kinetic Temperature

A P Mosk. Phys Rev Lett.

Abstract

We show that thermalization of the motion of atoms at negative temperature is possible in an optical lattice, for conditions that are feasible in current experiments. We present a method for reversibly inverting the temperature of a trapped gas. Moreover, a negative-temperature ensemble can be cooled (reducing |T|) by evaporation of the lowest-energy particles. This enables the attainment of the Bose-Einstein condensation phase transition at negative temperature.

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    Braun S, Friesdorf M, Hodgman SS, Schreiber M, Ronzheimer JP, Riera A, Del Rey M, Bloch I, Eisert J, Schneider U. Braun S, et al. Proc Natl Acad Sci U S A. 2015 Mar 24;112(12):3641-6. doi: 10.1073/pnas.1408861112. Epub 2015 Mar 9. Proc Natl Acad Sci U S A. 2015. PMID: 25775515 Free PMC article.

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