Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate

Shohei Watabe, Yusuke Kato, Yoji Ohashi

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We investigate tunneling properties of collective modes in the polar phase of a spin-1 spinor Bose-Einstein condensate (BEC). This spinor BEC state has two kinds of gapless modes (i.e., Bogoliubov and spin-wave). Within the framework of mean-field theory at T=0, we show that these Goldstone modes exhibit perfect transmission in the low-energy limit. Their anomalous tunneling behavior still holds in the presence of superflow, except in the critical current state. In the critical current state, while the tunneling of Bogoliubov mode is accompanied by finite reflection, the spin wave still exhibits perfect transmission, unless the strengths of spin-dependent and spin-independent interactions take the same value. We discuss the relation between perfect transmission of a spin wave and underlying superfluidity through a comparison of wave functions of the spin wave and the condensate.

本文言語English
論文番号013616
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
84
1
DOI
出版ステータスPublished - 2011 7月 25
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学

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