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Viscosity and scale invariance in the unitary Fermi gas
Fermi polarons in two dimensions
We theoretically analyze inverse radio-frequency (rf) spectroscopy experiments in two-component Fermi gases. We consider a small number of impurity atoms interacting strongly with a bath of majority…
Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region.
We report the experimental measurement of the equation of state of a two-dimensional Fermi gas with attractive s-wave interactions throughout the crossover from a weakly coupled Fermi gas to a Bose…
Quantum critical transport in the unitary Fermi gas
- T. Enss
- 9 April 2012
The thermodynamic and transport properties of the unitary Fermi gas at finite temperature T are governed by a quantum critical point at T = 0 and zero density. We compute the universal shear…
Excitation spectra and rf response near the polaron-to-molecule transition from the functional renormalization group
A light impurity in a Fermi sea undergoes a transition from a polaron to a molecule for increasing interaction. We develop a method to compute the spectral functions of the polaron and molecule in a…
Purification and many-body localization in cold atomic gases.
It is shown that measuring the difference in occupation between even and odd sites, starting from a prepared density-wave state, provides clear signatures of localization, and confirms as hallmarks of the many-body localized phase a logarithmic increase of the entanglement entropy in time and Poissonian level statistics.
Universal equation of state and pseudogap in the two-dimensional Fermi gas.
The thermodynamic properties and the spectral function for a homogeneous two-dimensional Fermi gas in the normal state are determined using the Luttinger-Ward, or self-consistent T-matrix, approach and it is suggested that temperature has a pronounced effect on the pressure in the crossover from weak to strong coupling.
Quantum mechanical limitations to spin diffusion in the unitary Fermi gas.
It is shown that the spin transport in the unitary Fermi gas using the strong-coupling Luttinger-Ward theory achieves a minimum value of D(s) and a maximum value of Γ(sd) in the quantum degenerate regime.
Bulk Viscosity and Contact Correlations in Attractive Fermi Gases.
- T. Enss
- PhysicsPhysical review letters
- 29 April 2019
For the quantum degenerate regime I report numerical Luttinger-Ward results for the contact correlator and the dynamical bulk viscosity throughout the BEC-BCS crossover, and the ratio of bulk to shear viscosities ζ/η is found to exceed the kinetic theory prediction in the quantum progressive regime.
Transverse spin diffusion in strongly interacting Fermi gases
- T. Enss
- 19 July 2013
h/m in the quantum degenerate regime and are strongly suppressed by medium scattering, and we discuss the importance of the spin-rotation effect. In two dimensions, D⊥ attains a minimum at strong…