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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number013616
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume84
Issue number1
DOIs
Publication statusPublished - 2011 Jul 25

Fingerprint

Bose-Einstein condensates
magnons
excitation
critical current
superfluidity
condensates
wave functions
interactions
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

@article{226ab07a47754795854b5dac0f7f8f62,
title = "Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate",
abstract = "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.",
author = "Shohei Watabe and Yusuke Kato and Yoji Ohashi",
year = "2011",
month = "7",
day = "25",
doi = "10.1103/PhysRevA.84.013616",
language = "English",
volume = "84",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate

AU - Watabe, Shohei

AU - Kato, Yusuke

AU - Ohashi, Yoji

PY - 2011/7/25

Y1 - 2011/7/25

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=79961124667&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79961124667&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.84.013616

DO - 10.1103/PhysRevA.84.013616

M3 - Article

VL - 84

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 1

M1 - 013616

ER -