Excitation Transport through a Domain Wall in a Bose-Einstein Condensate
Abstract
We investigate the tunneling properties of collective excitations through a domain wall in the ferromagnetic phase of a spin-1 spinor Bose--Einstein condensate. Within the mean-field theory at T=0, we show that the transverse spin wave undergoes perfect reflection in the low-energy limit. This reflection property differs considerably from that of a domain wall in a Heisenberg ferromagnet where spin-wave excitations exhibit perfect transmission at arbitrary energy. When the Bogoliubov mode is scattered from this domain wall soliton, the transmission and reflection coefficients exhibit pronounced non-monotonicity. In particular, we find perfect reflection of the Bogoliubov mode at energies where bound states appear. This is in stark contrast to the perfect transmission of the Bogoliubov mode with arbitrary energy through a dark soliton in a scalar Bose--Einstein condensate.
Keywords
Cite
@article{arxiv.1208.0381,
title = {Excitation Transport through a Domain Wall in a Bose-Einstein Condensate},
author = {Shohei Watabe and Yusuke Kato and Yoji Ohashi},
journal= {arXiv preprint arXiv:1208.0381},
year = {2013}
}
Comments
10 pages, 7 figures