Emergence of Chiral Magnetism in Spinor Bose-Einstein Condensate with Rashba Coupling
Abstract
Hydrodynamic theory of the spinor BEC condensate with Rashba spin-orbit coupling is presented. A close mathematical analogy of the Rashba-BEC model to the recently developed theory of chiral magnetism is found. Hydrodynamic equations for mass density, superfluid velocity, and the local magnetization are derived. The mass current is shown to contain an extra term proportional to the magnetization direction, as a result of the Rashba coupling. Elementary excitations around the two known ground states of the Rashba-BEC Hamiltonian, the plane-wave and the stripe states, are worked out in the hydrodynamic framework, highlighting the cross-coupling of spin and superflow velocity excitations due to the Rashba term.
Keywords
Cite
@article{arxiv.1201.3958,
title = {Emergence of Chiral Magnetism in Spinor Bose-Einstein Condensate with Rashba Coupling},
author = {Xiao-Qiang Xu and Jung Hoon Han},
journal= {arXiv preprint arXiv:1201.3958},
year = {2012}
}
Comments
4.2 pages, 1 figure, accepted for publication in PRL