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Towards quantitative precision in ultracold atoms with functional renormalisation
Bruno M. Faigle-Cedzich, Jan M. Pawlowski, Christof Wetterich
We compute the equation of state, the gap as well as the density fluctuations of a two-component superfluid Fermi gas over the whole range of BEC-BCS crossover at vanishing tempera…
Dimensional crossover in ultracold Fermi gases from Functional Renormalisation
Bruno M. Faigle-Cedzich, Jan M. Pawlowski, Christof Wetterich
We investigate the dimensional crossover from three to two dimensions in an ultracold Fermi gas across the whole BCS-BEC crossover. Of particular interest is the strongly interacti…
Dimensional crossover of nonrelativistic bosons
Soeren Lammers, Igor Boettcher, Christof Wetterich
We investigate how confining a transverse spatial dimension influences the few- and many-body properties of non-relativistic bosons with pointlike interactions. Our main focus is o…
Critical temperature and superfluid gap of the Unitary Fermi Gas from Functional Renormalization
Igor Boettcher, Jan M. Pawlowski, Christof Wetterich
We investigate the superfluid transition of the Unitary Fermi Gas by means of the Functional Renormalization Group, aiming at quantitative precision. We extract $T_{\rm c}/μ=0.38(2…
Error estimates and specification parameters for functional renormalization
David Schnoerr, Igor Boettcher, Jan M. Pawlowski +1
We present a strategy for estimating the error of truncated functional flow equations. While the basic functional renormalization group equation is exact, approximated solutions by…
Tan contact and universal high momentum behavior of the fermion propagator in the BCS-BEC crossover
Igor Boettcher, Sebastian Diehl, Jan M. Pawlowski +1
We derive the universal high momentum factorization of the fermion self-energy in the BCS-BEC crossover of ultracold atoms using nonperturbative quantum field theoretical methods.…
Quantum phase transition in Bose-Fermi mixtures
Denis Ludwig, Stefan Floerchinger, Sergej Moroz +1
We study a quantum Bose-Fermi mixture near a broad Feshbach resonance at zero temperature. Within a quantum field theoretical model a two-step Gaussian approximation allows to capt…
Hydrodynamic collective modes for cold trapped gases
Igor Boettcher, Stefan Floerchinger, Christof Wetterich
We suggest that collective oscillation frequencies of cold trapped gases can be used to test predictions from quantum many-body physics. Our motivation lies both in rigid experimen…
Nonperturbative thermodynamics of an interacting Bose gas
S. Floerchinger, C. Wetterich
We discuss the thermodynamics of a non-relativistic gas of bosons with a local repulsive interaction. In particular, we compute the temperature and density dependence of pressure,…