35 citations · 56 across the 8 of their papers we have counts for
8 papers
To infinity and back -- graph expansions of light-matter systems
Andreas Schellenberger, Kai P. Schmidt
We present a method for performing a full graph expansion for light-matter systems, utilizing the linked-cluster theorem. This method enables us to explore corrections to the…
Quantitative approach for the Dicke-Ising chain with an effective self-consistent matter Hamiltonian
J. Leibig, M. Hörmann, A. Langheld +2
In the thermodynamic limit, the Dicke-Ising chain maps exactly onto an effective self-consistent matter Hamiltonian with the photon field acting solely as a self-consistent effecti…
Comment on "Role of Matter Interactions in Superradiant Phenomena"
Max Hörmann, Anja Langheld, Jonas Leibig +2
Recently, Mendonça et al. [arXiv:2503.04961] investigated the Dicke-XXZ model and the Dicke-Ising model. For the latter model, their calculated quantum phase diagram contradicts cl…
Absence of topological order in the checkerboard toric code
M. Vieweg, V. Kott, L. Lenke +2
We investigate the checkerboard toric code which corresponds to the -symmetry enriched toric code with two distinct star sublattices. One can therefore tune from the l…
(Almost) Everything is a Dicke model -- Mapping non-superradiant correlated light-matter systems to the exactly solvable Dicke model
Andreas Schellenberger, Kai Phillip Schmidt
We investigate classes of interacting quantum spin systems in a single-mode cavity with a Dicke coupling, as a paradigmatic example of strongly correlated light-matter systems. Com…
Series expansions in closed and open quantum many-body systems with multiple quasiparticle types
L. Lenke, A. Schellenberger, K. P. Schmidt
The established approach of perturbative continuous unitary transformations (pCUTs) constructs effective quantum many-body Hamiltonians as perturbative series that conserve the num…
Dynamic structure factor of the antiferromagnetic Kitaev model in large magnetic fields
A. Schellenberger, M. Hörmann, K. P. Schmidt
We investigate the dynamic structure factor of the antiferromagnetic Kitaev honeycomb model in a magnetic field by applying perturbative continuous unitary transformations about th…
Quantum criticality and excitations of a long-range anisotropic -chain in a transverse field
P. Adelhardt, J. A. Koziol, A. Schellenberger +1
The critical breakdown of a one-dimensional quantum magnet with long-range interactions is studied by investigating the high-field polarized phase of the anisotropic XY model in a…