2011
DOI: 10.1140/epjd/e2011-20084-5
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Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases

Abstract: We analyze the properties of a single impurity immersed in a Fermi sea. At positive energy and scattering lengths, we show that the system possesses a well-defined but metastable excitation, the repulsive polaron, and we calculate its energy, quasiparticle residue and effective mass. From a thermodynamic argument we obtain the number of particles in the dressing cloud, illustrating the repulsive character of the polaron. Identifying the important 2-and 3-body decay channels, we furthermore calculate the lifeti… Show more

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Cited by 129 publications
(229 citation statements)
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References 43 publications
(65 reference statements)
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“…The theoretical curves are based on an extension of an approach presented in Refs. [12,23] to our case of a relatively narrow Feshbach resonance with κ F R * = 0.95 and thus a considerable effective range of the interaction (see Supplementary Information).…”
mentioning
confidence: 84%
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“…The theoretical curves are based on an extension of an approach presented in Refs. [12,23] to our case of a relatively narrow Feshbach resonance with κ F R * = 0.95 and thus a considerable effective range of the interaction (see Supplementary Information).…”
mentioning
confidence: 84%
“…The properties of the repulsive polaron, which is intrinsically unstable due to the presence of the molecule-hole continuum (MHC) and of the attractive polaron, are obtained from the self energy. In particular, the interaction induced energy shift and the decay rate are given by the real part and twice the imaginary part of the self energy, respectively [12].…”
Section: Theoretical Frameworkmentioning
confidence: 99%
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“…In fact, wave functions of the type in Eq. (7) were found to yield a rather accurate description of impurities coupled to a fermionic bath of cold atoms via Feshbach resonances [29][30][31][32][33] and also describe exciton impurities in two-dimensional semiconductors [34]. When truncated at the one-excitation level, such an ansatz leads to limited agreement with experimental observations for impurities in a Bose gas [35,36].…”
Section: Polaron Formationmentioning
confidence: 99%