Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective excitations of quasi-two-dimensional trapped dipolar
  fermions: transition from collisionless to hydrodynamic regime   We study the collective excitations of polarized single-component
quasi-two-dimensional dipolar fermions in an isotropic harmonic trap by solving
the collisional Boltzmann-Vlasov (CBV) equation. We study the response to both
monopole and quadrupole perturbations of the trap potential and investigate the
character of excitations in each case. Simple analytic formulas are provided
based on the linearized scaling ansatz and accurate numerical results are
obtained by satisfying the first eight moments of the CBV equation. Except for
the lowest lying monopole mode that exhibits a negligible damping in all of the
studied cases, the quadrupole and the higher order monopole modes undergo a
transition from the collisionless regime to a highly dissipative crossover
regime and finally to the hydrodynamic regime upon increasing the dipolar
interaction strength. For strong vertical confinements (2D limit), we predict
the existence of a temperature window within which the characteristics of the
collective modes become temperature independent. This behavior, which is a
unique feature of the universal near-threshold dipole-dipole scatterings,
persists as long as the scattering energies remain in the near-threshold
regime. The predictions of this work are expected to be in the reach of current
experiments.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org