Spin correlation and superfluidity of trapped fermi atoms on an optical lattice

Masahiko Machida, Susumu Yamada, Yoji Ohashi, Hideki Matsumoto

研究成果: Conference contribution

抜粋

We investigate a possibility of superfluidity in a trapped gas of Fermi atoms with repulsive interaction U in the presence of an optical lattice. Applying the exact diagonalization method to a one-dimensional fermion-Hubbard model including the trap potential, we find that, when U exceeds a critical value, the binding energy of two Fermi atoms becomes negative indicating that an attractive interaction effectively works. In this case, a "Mott core" appears in the trap center, where each site is occupied by one atom, and a large Cooper-pair amplitude develops between atoms in the left and right hand sides of this core. In order to clarify the origin of the attractive force, we compute a pseudo spin correlation between neighboring sites given by 〈SiSi+1〉. As a result, we find that a creation of a singlet pair between both sides of the Mott core is strongly coupled with a pseudo-spin singlet re-formation leading to an energy gain process.

元の言語English
ホスト出版物のタイトルLOW TEMPERATURE PHYSICS
ホスト出版物のサブタイトル24th International Conference on Low Temperature Physics - LT24
ページ61-62
ページ数2
DOI
出版物ステータスPublished - 2006 12 1
外部発表Yes
イベントLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
継続期間: 2006 8 102006 10 17

出版物シリーズ

名前AIP Conference Proceedings
850
ISSN(印刷物)0094-243X
ISSN(電子版)1551-7616

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
United States
Orlando, FL
期間06/8/1006/10/17

    フィンガープリント

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Machida, M., Yamada, S., Ohashi, Y., & Matsumoto, H. (2006). Spin correlation and superfluidity of trapped fermi atoms on an optical lattice. : LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 61-62). (AIP Conference Proceedings; 巻数 850). https://doi.org/10.1063/1.2354607