期刊
PHYSICAL REVIEW A
卷 84, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.84.023638
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- SNF [PP002-118866]
- [20740194]
- Grants-in-Aid for Scientific Research [20740194] Funding Source: KAKEN
We investigate the attractive Hubbard model in infinite spatial dimensions by combining dynamical mean-field theory with a strong-coupling continuous-time quantum Monte Carlo method. By calculating the superfluid order parameter and the density of states, we discuss the stability of the superfluid state. In the intermediate-coupling region above the critical temperature, the density of states exhibits a heavy fermion behavior with a quasiparticle peak in the dense system, while a dip structure appears in the dilute system. The formation of the superfluid gap is also addressed.
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