Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossover polarons in a strongly interacting Fermi superfluid   We investigate the zero-temperature quasiparticle properties of a mobile
impurity immersed in a strongly interacting Fermi superfluid at the crossover
from a Bose-Einstein condensate (BEC) to a Bardeen--Cooper--Schrieffer (BCS)
superfluid, by using a many-body $T$-matrix approach that excludes Efimov
trimer bound states. Termed BEC-BCS crossover polaron, or crossover polaron in
short, this quasiparticle couples to elementary excitations of a many-body
background and therefore could provide a useful probe of the underlying
strongly interacting Fermi superfluid. Due to the existence of a significant
pairing gap $\Delta$, we find that the repulsive polaron branch becomes less
well-defined. In contrast, the attractive polaron branch is protected by the
pairing gap and becomes more robust at finite momentum. It remains as a
delta-function peak in the impurity spectral function below a threshold
$2\Delta$. Above the threshold, the attractive polaron enters the particle-hole
continuum and starts to get damped. We predict the polaron energy, residue and
effective mass for realistic Bose-Fermi mixtures, where the minority bosonic
atoms play the role of impurity. These results are practically useful for
future cold-atom experiments on crossover polarons.

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The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: eess