2009 Fiscal Year Final Research Report
Pseudogap effects in the BCS-BEC crossover regime of a Fermi gas
| Project/Area Number |
19540420
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
原子・分子・量子エレクトロニクス・プラズマ
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| Research Institution | Keio University |
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Principal Investigator |
OHASHI Yoji Keio University, 理工学部, 准教授 (60272134)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 超流動 / フェルミ原子ガス / BCS-BECクロスオーバー |
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| Research Abstract |
I have theoretically investigated strong coupling effects in the BCS-BEC crossover regime of an ultra-cold Fermi gas. Using a strong-coupling fluctuation theory, I have studied pseudo-gap phenomena in the density of states, as well as single-particle spectral weight, in the normal state above the superfluid phase transition temperature. I showed how the pseudo-gap disappears as one increases the temperature, and determined the pseudo-gap temperature over the entire BCS-BEC crossover region.
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