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

Yoji Ohashi, Naoki Fukushima

研究成果: Conference contribution

抄録

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.

本文言語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
出版社World Scientific Publishing Co. Pte Ltd
ページ18-23
ページ数6
ISBN(印刷版)981428212X, 9789814282123
DOI
出版ステータスPublished - 2009
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月 252008 8月 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
国/地域Japan
CityHatoyama, Saitama
Period08/8/2508/8/28

ASJC Scopus subject areas

  • 原子分子物理学および光学

フィンガープリント

「Superfluid properties of an ultracold Fermi gas in the BCS-BEC crossover region」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル