Critical Behavior of a Trapped Interacting Bose Gas

  • Donner T
  • Ritter S
  • Bourdel T
 et al. 
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The phase transition of Bose-Einstein condensation is studied in the critical regime, when fluctuations extend far beyond the length scale of thermal de Broglie waves. Using matter-wave interference we measure the correlation length of these critical fluctuations as a function of temperature. The diverging behavior of the correlation length above the critical temperature is observed, from which we determine the critical exponent of the correlation length for a trapped, weakly interacting Bose gas to be $
u=0.67\pm 0.13$. This measurement has direct implications for the understanding of second order phase transitions.

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  • Tobias Donner

  • Stephan Ritter

  • Thomas Bourdel

  • Anton Öttl

  • Michael Köhl

  • Tilman Esslinger

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