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arxiv: 1003.4735 · v1 · pith:45YYW5G2new · submitted 2010-03-24 · ❄️ cond-mat.str-el

Topological quantum phase transition in the BEC-BCS crossover phenomena

classification ❄️ cond-mat.str-el
keywords phasecrossoverquantumtransitionaccompanyingattractivebec-bcsberry
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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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