Viscosity and scale invariance in the unitary Fermi gas
- T. Enss, R. Haussmann, W. Zwerger
- Physics
- 30 July 2010
Fermi polarons in two dimensions
- R. Schmidt, T. Enss, V. Pietila, E. Demler
- Physics
- 7 October 2011
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.
- I. Boettcher, L. Bayha, T. Enss
- PhysicsPhysical Review Letters
- 11 September 2015
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 mechanical limitations to spin diffusion in the unitary Fermi gas.
- T. Enss, R. Haussmann
- PhysicsPhysical Review Letters
- 12 July 2012
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.
Quantum critical transport in the unitary Fermi gas
- T. Enss
- Physics
- 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
- R. Schmidt, T. Enss
- Physics
- 7 April 2011
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.
- F. Andraschko, T. Enss, J. Sirker
- PhysicsPhysical Review Letters
- 16 July 2014
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.
Exploring the ferromagnetic behaviour of a repulsive Fermi gas through spin dynamics
- G. Valtolina, F. Scazza, G. Roati
- PhysicsNature Physics
- 25 May 2016
Ferromagnetism is a manifestation of strong repulsive interactions between itinerant fermions in condensed matter. Whether short-ranged repulsion alone is sufficient to stabilize ferromagnetic…
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.
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