p-Wave Polaron
p-Wave Polaron
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.
075302-1-075302-5
Levinsen, Jesper
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Massignan, Pietro
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Chevy, Frederic
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Lobo, Carlos
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August 2012
Levinsen, Jesper
60e683be-857c-442d-bcd8-f71495763f8b
Massignan, Pietro
c5fa304f-6e14-42d0-a2d2-82e1c9e16b90
Chevy, Frederic
841c3e56-8aab-4094-a6a8-99ee8855f511
Lobo, Carlos
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Levinsen, Jesper, Massignan, Pietro, Chevy, Frederic and Lobo, Carlos
(2012)
p-Wave Polaron.
Physical Review Letters, 109 (75302), .
(doi:10.1103/PhysRevLett.109.075302).
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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Submitted date: March 2012
e-pub ahead of print date: March 2012
Published date: August 2012
Organisations:
Mathematical Sciences
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Local EPrints ID: 339051
URI: http://eprints.soton.ac.uk/id/eprint/339051
PURE UUID: 4e261269-2be5-4997-b2a7-899f117c0bd2
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Date deposited: 22 May 2012 11:13
Last modified: 15 Mar 2024 03:32
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Author:
Jesper Levinsen
Author:
Pietro Massignan
Author:
Frederic Chevy
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