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Few is different: deciphering many-body dynamics in mesoscopic quantum gases
Juergen Berges, Sandra Brandstetter, Jasmine Brewer +27
Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventi…
Determination of the density and temperature dependence of the shear viscosity of a unitary Fermi gas based on hydrodynamic flow
Marcus Bluhm, Jiaxun Hou, Thomas Schaefer
We determine the shear viscosity of the ultracold Fermi gas at unitarity in the normal phase using hydrodynamic expansion data. The analysis is based on a generalized fluid dynamic…
A generalized Theory of Diffusion based on Kinetic Theory
Thomas Schaefer
We propose to use spin hydrodynamics, a two-fluid model of spin propagation, as a generalization of the diffusion equation. We show that in the dense limit spin hydrodynamics reduc…
Model-independent determination of the shear viscosity of a trapped unitary Fermi gas: Application to high temperature data
Marcus Bluhm, Thomas Schaefer
Determinations of the shear viscosity of trapped ultracold gases suffer from systematic, uncontrolled uncertainties related to the treatment of the dilute part of the gas cloud. In…
Dissipative fluid dynamics for the dilute Fermi gas at unitarity: Anisotropic fluid dynamics
Marcus Bluhm, Thomas Schaefer
We consider the time evolution of a dilute atomic Fermi gas after release from a trapping potential. A common difficulty with using fluid dynamics to study the expansion of the gas…
Medium effects and the shear viscosity of the dilute Fermi gas away from the conformal limit
Marcus Bluhm, Thomas Schaefer
We study the shear viscosity of a dilute Fermi gas as a function of the scattering length in the vicinity of the unitarity limit. The calculation is based on kinetic theory, which…
Second order fluid dynamics for the unitary Fermi gas from kinetic theory
Thomas Schaefer
We compute second order transport coefficients of the dilute Fermi gas at unitarity. The calculation is based on kinetic theory and the Boltzmann equation at second order in the Kn…
Scale breaking and fluid dynamics in a dilute two-dimensional Fermi gas
Clifford Chafin, Thomas Schaefer
We study two observables related to the anomalous breaking of scale invariance in a dilute two dimensional Fermi gas, the frequency shift and damping rate of the monopole mode in a…
Bulk viscosity and conformal symmetry breaking in the dilute Fermi gas near unitarity
Thomas Schaefer, Kevin Dusling
The dilute Fermi gas at unitarity is scale invariant and its bulk viscosity vanishes. We compute the leading contribution to the bulk viscosity when the scattering length is not in…
Quasiclassical molecular dynamics for the dilute Fermi gas at unitarity
Kevin Dusling, Thomas Schaefer
We study the dilute Fermi gas at unitarity using molecular dynamics with an effective quantum potential constructed to reproduce the quantum two-body density matrix at unitarity. R…
Shear viscosity and damping of collective modes in a two-dimensional Fermi gas
Thomas Schaefer
We compute the shear viscosity of a two dimensional Fermi gas interacting via a short range potential with scattering length in kinetic theory. We find that kinetic theory…
Viscosity spectral functions of the dilute Fermi gas in kinetic theory
J. Chao, M. Braby, T. Schaefer
We compute the viscosity spectral function of the dilute Fermi gas for different values of the s-wave scattering length , including the unitarity limit . We perform…
Dissipative fluid dynamics for the dilute Fermi gas at unitarity: Free expansion and rotation
Thomas Schaefer
We investigate the expansion dynamics of a dilute Fermi gas at unitarity in the context of dissipative fluid dynamics. Our aim is to quantify the effects of shear viscosity on the…
Universal Quantum Viscosity in a Unitary Fermi Gas
C. Cao, E. Elliott, J. Joseph +4
A Fermi gas of atoms with resonant interactions is predicted to obey universal hydrodynamics, where the shear viscosity and other transport coefficients are universal functions of…
Thermal Conductivity and Sound Attenuation in Dilute Atomic Fermi Gases
Matt Braby, Jingyi Chao, Thomas Schaefer
We compute the thermal conductivity and sound attenuation length of a dilute atomic Fermi gas in the framework of kinetic theory. Above the critical temperature for superfluidity,…