The p-wave polaron
Abstract
We consider the properties of a single impurity immersed in a Fermi sea close to an interspecies p-wave Feshbach resonance. We calculate its dispersion and spectral response to a radiofrequency pulse. In the presence of a magnetic field, dipolar interactions split the resonance and lead to the appearance of two novel features with respect to the s-wave case: a third polaron branch in the excitation spectrum, in addition to the usual attractive and repulsive ones; and an anisotropic dispersion of the impurity characterized by different effective masses perpendicular and parallel to the magnetic field. The anisotropy can be tuned as a function of the field strength and the two effective masses may have opposite signs, or become smaller than the bare mass.
Cite
@article{arxiv.1203.6881,
title = {The p-wave polaron},
author = {Jesper Levinsen and Pietro Massignan and Frédéric Chevy and Carlos Lobo},
journal= {arXiv preprint arXiv:1203.6881},
year = {2012}
}
Comments
5 pages, 5 figures