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arXiv · 1203.6881

The p-wave polaron

Jesper Levinsen·Pietro Massignan·Frédéric Chevy·Carlos Lobo
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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.

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Jesper Levinsen, Pietro Massignan, Frédéric Chevy, Carlos Lobo. 2012-03-30. The p-wave polaron. https://doi.org/10.1103/physrevlett.109.075302

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