- 著者
- Arikawa Mitsuhiro Maruyama Isao Hatsugai Yasuhiro
- 出版者
- American Physical Society
- 雑誌
- Physical review B (ISSN:10980121)
- 巻号頁・発行日
- vol.82, no.7, pp.073105, 2010-10
- 被引用文献数
- 10
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 Z2 Berry phase, we found a quantum phase transition between the BEC and BCS phases without accompanying the bulk gap closing.