Topological quantum phase transition in the BEC-BCS crossover phenomena

Published 24 Mar 2010 in cond-mat.str-el | (1003.4735v1)

Abstract: A crossover between the Bose Einstein condensation (BEC) and BCS superconducting state is described topologically in the chiral symmetric fermion system with attractive interaction. Using a local Z_2 Berry phase, we found a quantum phase transition between the BEC and BCS phases without accompanying the bulk gap closing.

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