18 citations · 52 across the 12 of their papers we have counts for
10 papers · 1 filter
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, Dag-Björn Hering, Vanessa Sulaiman +3
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, M. Hörmann, K. P. Schmidt
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…
Quantum melting of long-range ordered quantum antiferromagnets investigated by momentum-space continuous similarity transformations
Dag-Björn Hering, Matthias R. Walther, Kai P. Schmidt +1
We apply continuous similarity transformations (CSTs) to study the zero-temperature breakdown of long-range ordered quantum antiferromagnets. The CST flow equations are truncated i…
Quantitative description of long-range order in the anisotropic spin-1/2 Heisenberg antiferromagnet on the square lattice
Nils Caci, Dag-Björn Hering, Matthias R. Walther +3
The quantitative description of long-range order remains a challenge in quantum many-body physics. We provide zero-temperature results from two complementary methods for the ground…
Extracting quantum-critical properties from directly evaluated enhanced perturbative continuous unitary transformations
L. Schamriß, M. R. Walther, K. P. Schmidt
Directly evaluated enhanced perturbative continuous unitary transformations (deepCUTs) are used to calculate non-perturbatively extrapolated numerical data for the ground-state ene…
Order-by-disorder and long-range interactions in the antiferromagnetic transverse-field Ising model on the triangular lattice -- A perturbative point of view
J. A. Koziol, M. Mühlhauser, K. P. Schmidt
We study the low-field ground-state (GS) properties of the antiferromagnetic transverse-field Ising model with long-range interactions (afLRTFIM) on the triangular lattice. We use…
Linked-cluster expansions for quantum magnets on the hypercubic lattice
K. Coester, D. G. Joshi, M. Vojta +1
For arbitrary space dimension we investigate the quantum phase transitions of two paradigmatic spin models defined on a hypercubic lattice, the coupled-dimer Heisenberg model a…
Bounds on universal quantum computation with perturbed 2d cluster states
R. Orus, H. Kalis, M. Bornemann +1
Motivated by the possibility of universal quantum computation under noise perturbations, we compute the phase diagram of the 2d cluster state Hamiltonian in the presence of Ising t…