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3/2-Body Correlations and Coherence in Bose-Einstein Condensates by Kita, Takafumi is a scholarly article available to read on EtoBox.

What is 3/2-Body Correlations and Coherence in Bose-Einstein Condensates about?

We construct a variational wave function for the ground state of weakly interacting bosons that gives a lower energy than the mean-field Girardeau-Arnowitt (or Hartree-Fock-Bogoliubov) theory. This improvement is brought about by incorporating the dynamical 3/2-body processes where one of two colliding non-condensed particles drops into the condensate and vice versa. The processes are also shown to transform the one-particle excitation spectrum into a bubbling mode with a finite lifetime even in the long-wavelength limit. These 3/2-body processes, which give rise to dynamical exchange of particles between the non-condensate reservoir and condensate absent in ideal gases, are identified as a key mechanism for realizing and sustaining macroscopic coherence in Bose-Einstein condensates.

Author

Kita, Takafumi

Published

2017

Language

EN