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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.

Authors:
;  [1];  [2];  [3]
  1. Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan)
  2. (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan)
  3. Department of Basic Science, University of Tokyo, Tokyo 153-8902 (Japan)
Publication Date:
OSTI Identifier:
22058749
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSE-EINSTEIN CONDENSATION; COLLECTIVE EXCITATIONS; CRITICAL CURRENT; MEAN-FIELD THEORY; SPIN; SPIN WAVES; TUNNEL EFFECT; WAVE FUNCTIONS

Citation Formats

Watabe, Shohei, Ohashi, Yoji, CREST, and Kato, Yusuke. Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.013616.
Watabe, Shohei, Ohashi, Yoji, CREST, & Kato, Yusuke. Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate. United States. doi:10.1103/PHYSREVA.84.013616.
Watabe, Shohei, Ohashi, Yoji, CREST, and Kato, Yusuke. Fri . "Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate". United States. doi:10.1103/PHYSREVA.84.013616.
@article{osti_22058749,
title = {Anomalous tunneling of collective excitations and effects of superflow in the polar phase of a spin-1 spinor Bose-Einstein condensate},
author = {Watabe, Shohei and Ohashi, Yoji and CREST and Kato, Yusuke},
abstractNote = {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.},
doi = {10.1103/PHYSREVA.84.013616},
journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}