91 citations · 589 across the 28 of their papers we have counts for
28 papers
Generalized diagonalization scheme for many-particle systems
Steffen Sykora, Arnd Hübsch, Klaus W. Becker
Despite the advances in the development of numerical methods analytical approaches still play the key role on the way towards a deeper understanding of many-particle systems. In th…
Projector-based renormalization approach to electron-hole-photon systems in nonequlibrium steady-state
Klaus W. Becker, Holger Fehske, Van-Nham Phan
We present an extended version of the projector-based renormalization method that can be used to address not only equilibrium but also non-equilibrium situations in coupled fermion…
Unconventional superconductivity and interaction induced Fermi surface reconstruction in the two-dimensional Edwards model
Dai-Ning Cho, Jeroen van den Brink, Holger Fehske +2
We study the competition between unconventional superconducting pairing and charge density wave (CDW) formation for the two-dimensional Edwards Hamiltonian at half filling, a very…
Ground-state and spectral signatures of cavity exciton-polariton condensates
Van-Nham Phan, Klaus W. Becker, Holger Fehske
We propose a projector-based renormalization framework to study exciton-polariton Bose-Einstein condensation in a microcavity matter-light system. Treating Coulomb interaction and…
Linear response within the projection-based renormalization method: Many-body corrections beyond the random phase approximation
Van-Nham Phan, Klaus W. Becker, Holger Fehske
The explicit evaluation of linear response coefficients for interacting many-particle systems still poses a considerable challenge to theoreticians. In this work we use a novel man…
Spectral signatures of the BCS-BEC crossover in the excitonic insulator phase of the extended Falicov-Kimball model
Nham Van Phan, Klaus W. Becker, Holger Fehske
We explore the spontaneous formation of an excitonic insulator state at the semimetal-semiconductor transition of mixed-valence materials in the framework of the spinless Falicov-K…