Stability criterion for superfluidity based on the density spectral function

Shohei Watabe, Yusuke Kato

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We study a stability criterion hypothesis for superfluids expressed in terms of the local density spectral function In(r,ω) that is applicable to both homogeneous and inhomogeneous systems. We evaluate the local density spectral function in the presence of a one-dimensional repulsive or attractive external potential within Bogoliubov theory, using solutions for the tunneling problem. We also evaluate the local density spectral function using an orthogonal basis, and calculate the autocorrelation function C n(r,t). When superfluids in a d-dimensional system flow below a threshold, In(r,ω)â̂ωd holds in the low-energy regime and Cn(r,t)â̂1/td+1 holds in the long-time regime. However, when superfluids flow with the critical current, In(r,ω)â̂ωβ holds in the low-energy regime and Cn(r,t)â̂1/tβ+1 holds in the long-time regime with β<d. These results support the stability criterion hypothesis recently proposed.

本文言語English
論文番号063612
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
88
6
DOI
出版ステータスPublished - 2013 12月 6
外部発表はい

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

「Stability criterion for superfluidity based on the density spectral function」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