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12 papers · 1 filter
Schoenberg Correspondence on Dual Groups
Michael Schürmann, Stefan Voß
As in the classical case of Lévy processes on a group, Lévy processes on a Voiculescu dual group are constructed from conditionally positive functionals. It is essential for this c…
Quantum phase transition in the Dicke model with critical and non-critical entanglement
L. Bakemeier, A. Alvermann, H. Fehske
We study the quantum phase transition of the Dicke model in the classical oscillator limit, where it occurs already for finite spin length. In contrast to the classical spin limit,…
Phase diagram of bilayer electron-hole plasmas
J. Schleede, A. Filinov, M. Bonitz +1
We investigate exciton bound-state formation and crystallization effects in two-dimensional electron-hole bilayers. Performing unbiased path integral Monte Carlo simulations all qu…
Equilibration and thermalization of the dissipative quantum harmonic oscillator in a non-thermal environment
D. Pagel, A. Alvermann, H. Fehske
We study the dissipative quantum harmonic oscillator with general non-thermal preparations of the harmonic oscillator bath. The focus is on equilibration of the oscillator in the l…
Numerical time propagation of quantum systems in radiation fields
A. Alvermann, H. Fehske, P. B. Littlewood
Atoms, molecules or excitonic quasiparticles, for which excitations are induced by external radiation fields and energy is dissipated through radiative decay, are examples of drive…
Effect of Electron-Phonon Interaction Range for a Half-Filled Band in One Dimension
Martin Hohenadler, Fakher F. Assaad, Holger Fehske
We demonstrate that fermion-boson models with nonlocal interactions can be simulated at finite band filling with the continuous-time quantum Monte Carlo method. We apply this metho…