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

Shunji Tsuchiya, Yoji Ohashi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number013628
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume78
Issue number1
DOIs
Publication statusPublished - 2008 Jul 22

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Anomalous enhancement of quasiparticle current near a potential barrier in a Bose-Einstein condensate'. Together they form a unique fingerprint.

Cite this