Coleman-Weinberg mechanism in spinor Bose-Einstein condensates
DPMC-MaNEP, University of Geneva - 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland
Received: 7 May 2014
Accepted: 17 July 2014
It is argued that a continuous quantum phase transition between different ordered phases in spinor Bose-Einstein condensates predicted by the mean-field theory is vulnerable to quantum fluctuations. By analyzing Lee-Huang-Yang corrections in the condensate, we demonstrate that the so-called Coleman-Weinberg mechanism takes place in such a transition, that is, the transition becomes of the first order by quantum fluctuations. A jump to be expected in this first-order transition is induced by a correction from density fluctuations despite a transition between different magnetic properties with keeping condensation. We exemplify this with an experimentally relevant case and show that a measurement of a condensate depletion can be utilized to confirm the first-order transition.
PACS: 05.30.Jp – Boson systems / 03.75.Hh – Static properties of condensates; thermodynamical, statistical, and structural properties / 03.75.Mn – Multicomponent condensates; spinor condensates
© EPLA, 2014