Superfluid properties of an ultracold Fermi gas in the BCS-BEC crossover region

Yoji Ohashi, Naoki Fukushima

研究成果: Conference contribution

抜粋

We investigate superfluid properties of a two-component Fermi gas in the BCS-BEC crossover region. Including strong-coupling effects within a Gaussian fluctuation approximation, we self-consistently determine the superfluid order parameter and chemical potential at finite temperatures. Using these self-consistent solutions, we calculate single-particle excitations, as well as collective mode, over the entire BCS-BEC crossover region. As one increases the strength of a pairing interaction, we show that, while the single-particle excitation gap becomes large, the velocity of collective Goldstone mode becomes small. As a result, the origin of temperature dependence of a physical quantity continuously changes from single-particle excitations to collective excitations, as one passes through the BCS-BEC crossover region. To see this, we examine the superfluid density.

元の言語English
ホスト出版物のタイトルProceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
出版者World Scientific Publishing Co. Pte Ltd
ページ18-23
ページ数6
ISBN(印刷物)981428212X, 9789814282123
出版物ステータスPublished - 2009 1 1
イベント9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 - Hatoyama, Saitama, Japan
継続期間: 2008 8 252008 8 28

出版物シリーズ

名前Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008

Other

Other9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
Japan
Hatoyama, Saitama
期間08/8/2508/8/28

    フィンガープリント

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

これを引用

Ohashi, Y., & Fukushima, N. (2009). Superfluid properties of an ultracold Fermi gas in the BCS-BEC crossover region. : Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 (pp. 18-23). (Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008). World Scientific Publishing Co. Pte Ltd.