Atomic Gases at Negative Kinetic Temperature

Allard Mosk

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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.
Original languageUndefined
Pages (from-to)1-4
Number of pages4
JournalPhysical review letters
Issue number040403
Publication statusPublished - 2005


  • IR-52986
  • METIS-225066

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