5 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…
Quantum decay of magnons in the unfrustrated honeycomb Heisenberg model
Calvin Krämer, Calvin Krämer, Dag-Björn Hering +6
We investigate the physical properties of elementary magnon excitations of the ordered antiferromagnetic Heisenberg model on the honeycomb lattice using quantum Monte Carlo (QMC) s…
Immobile and mobile excitations of three-spin interactions on the diamond chain
M. Bayer, M. Vieweg, K. P. Schmidt
We present a solvable one-dimensional spin-1/2 model on the diamond chain featuring three-spin interactions, which displays both, mobile excitations driving a second-order phase tr…
Quantum Monte Carlo study of the bond- and site-diluted transverse-field Ising model
C. Krämer, C. Krämer, M. Hörmann +2
We study the transverse-field Ising model on a square lattice with bond- and site-dilution at zero temperature by stochastic series expansion quantum Monte Carlo simulations. Tunin…
Hybrid quantum-classical algorithm for the transverse-field Ising model in the thermodynamic limit
Sumeet, M. Hörmann, K. P. Schmidt
We describe a hybrid quantum-classical approach to treat quantum many-body systems in the thermodynamic limit. This is done by combining numerical linked-cluster expansions (NLCE)…