167 citations · 1.2k across the 33 of their papers we have counts for
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Self-energy functional theory with symmetry breaking for disordered lattice bosons
Dario Hügel, Hugo U. R. Strand, Lode Pollet
We extend the self-energy functional theory (SFT) to the case of interacting lattice bosons in the presence of symmetry breaking and quenched disorder. The self-energy functional w…
The anisotropic Harper-Hofstadter-Mott model: competition between condensation and magnetic fields
Dario Hügel, Hugo U. R. Strand, Philipp Werner +1
We derive the reciprocal cluster mean-field method to study the strongly-interacting bosonic Harper-Hofstadter-Mott model. The system exhibits a rich phase diagram featuring band i…
Bosonic self-energy functional theory
Dario Hügel, Philipp Werner, Lode Pollet +1
We derive the self-energy functional theory for bosonic lattice systems with broken symmetry by parametrizing the bosonic Baym-Kadanoff effective action in terms of one- and…
Beyond the Hubbard bands in strongly correlated lattice bosons
Hugo U. R. Strand, Martin Eckstein, Philipp Werner
We investigate features in the single-particle spectral function beyond the Hubbard bands in the strongly correlated normal phase of the Bose-Hubbard model. There are two distinct…
Nonequilibrium dynamical mean-field theory for bosonic lattice models
Hugo U. R. Strand, Martin Eckstein, Philipp Werner
We develop the nonequilibrium extension of bosonic dynamical mean field theory (BDMFT) and a Nambu real-time strong-coupling perturbative impurity solver. In contrast to Gutzwiller…