Anomalous enhancement of quasiparticle current near a potential barrier in a Bose-Einstein condensate

Shunji Tsuchiya, Yoji Ohashi

研究成果: Article査読

12 被引用数 (Scopus)

抄録

We investigate tunneling properties of Bogoliubov phonons in a Bose-Einstein condensate. We find the anomalous enhancement of the quasiparticle current Jq carried by Bogoliubov phonons near a potential barrier, due to the supply of the excess current from the condensate. This effect leads to the increase of quasiparticle transmission probability in the low energy region found by Kovrizhin We also show that the quasiparticle current twists the phase of the condensate wave function across the barrier, leading to a finite Josephson supercurrent Js through the barrier. This induced supercurrent flows in the opposite direction to the quasiparticle current so as to cancel out the enhancement of Jq and conserve the total current J= Jq + Js.

本文言語English
論文番号013628
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
78
1
DOI
出版ステータスPublished - 2008 7 22

ASJC Scopus subject areas

  • 原子分子物理学および光学

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