Pairing, Ferromagnetism, and Condensation of a normal spin-1 Bose gas
Abstract
We theoretically study the stability of a normal, spin disordered, homogenous spin-1 Bose gas against ferromagnetism, pairing, and condensation through a Random Phase Approximation which includes exchange (RPA-X). Repulsive spin-independent interactions stabilize the normal state against both ferromagnetism and pairing, and for typical interaction strengths leads to a direct transition from an unordered normal state to a fully ordered single particle condensate. Atoms with much larger spin-dependent interaction may experience a transition to a ferromagnetic normal state or a paired superfluid, but, within the RPA-X, there is no instability towards a normal state with spontaneous nematic order. We analyze the role of the quadratic Zeeman effect and finite system size.
Keywords
Cite
@article{arxiv.1101.5639,
title = {Pairing, Ferromagnetism, and Condensation of a normal spin-1 Bose gas},
author = {Stefan S. Natu and Erich J. Mueller},
journal= {arXiv preprint arXiv:1101.5639},
year = {2011}
}
Comments
4 pages, 3 figures, 1 table. Supplementary materials attached