88 citations · 278 across the 24 of their papers we have counts for
24 papers
Quasi-flat plasmonic bands in twisted bilayer graphene
T. Stauber, H. Kohler
The charge susceptibility of twisted bilayer graphene is investigated in the Dirac cone, respectively random-phase approximation. For small enough twist angles …
Effective interaction in an unbalanced Fermion mixture
Christian Recher, Heinerich Kohler
A one dimensional Fermi mixture with delta--interaction is investigated in the limit of extreme imbalance. In particular we consider the cases of only one or two minority Fermions…
Non-equilibrium dynamics of a system with Quantum Frustration
Heiner Kohler, Andreas Hackl, Stefan Kehrein
Using flow equations, equilibrium and non-equilibrium dynamics of a two-level system are investigated, which couples via non-commuting components to two independent oscillator bath…
Fidelity and level correlations in the transition from regularity to chaos
Heiner Kohler, Christian Recher
Mean fidelity amplitude and parametric energy--energy correlations are calculated exactly for a regular system, which is subject to a chaotic random perturbation. It turns out that…
Minimal coupling in oscillator models of quantum dissipation
Heiner Kohler, Fernando Sols
The dissipative harmonic oscillator has two representations. In the first representation the central oscillator couples with its position to an oscillator bath. In the second one i…
From hardcore Bosons to free Fermions with Painlev{é} V
Christian Recher, Heiner Kohler
We calculate zero temperature Green's function, the density--density correlation and expectation values of a one--dimensional quantum particle which interacts with a Fermi--sea via…