Topological quantum phase transition in the BEC-BCS crossover phenomena

Details Topological quantum phase transition in the BEC-BCS crossover phenomena Topological quantum phase transition in the BEC-BCS crossover phenomena

2010-03-24

arxiv.org/abs/1003.4735v1

Phys. Rev. B 82, 073105 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.073105

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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