Topological quantum phase transition in the BEC-BCS crossover phenomena
classification
❄️ cond-mat.str-el
keywords
phasecrossoverquantumtransitionaccompanyingattractivebec-bcsberry
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read the original 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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