53 citations · 197 across the 16 of their papers we have counts for
17 papers
Geometry Dependence of Error Thresholds in Two-Dimensional Toric Codes
D. Lessing, A. Langheld, C. Krämer +2
We investigate how the lattice geometry influences the error thresholds of two-dimensional toric codes. In the presence of bit- or phase-flip errors, the toric code maps onto the t…
Quantum criticality of the ferromagnetic Dicke-Ising model
Jan Alexander Koziol
We describe the quantum phase transitions in the ferromagnetic Dicke-Ising model using a Landau theory approach. The theory quantitatively captures the change from a second- to a f…
Quantum annealing for lattice models with competing long-range interactions
Jan Alexander Koziol, Kai Phillip Schmidt
We use superconducting qubit quantum annealing devices to determine the ground state of Ising models with algebraically decaying competing long-range interactions in the thermodyna…
Symmetry breaking and competing valence bond states in the star lattice Heisenberg antiferromagnet
Pratyay Ghosh, Jan Koziol, Samuel Nyckees +2
We investigate the ground state phase diagram of the spin- antiferromagnetic Heisenberg model on the star lattice using infinite projected entangled pair states (iPEPS) and hi…
Melting of devil's staircases in the long-range Dicke-Ising model
Jan Alexander Koziol, Anja Langheld, Kai Phillip Schmidt
We present quantum phase diagrams for the antiferromagnetic long-range Ising model with a linear coupling to a single bosonic mode on the square and triangular lattice. For zero co…
Observation of Unprecedented Fractional Magnetization Plateaus in a New Shastry-Sutherland Ising Compound
Lalit Yadav, Afonso Rufino, Rabindranath Bag +10
Geometrically frustrated magnetic systems, such as those based on the Shastry-Sutherland lattice (SSL), offer a rich playground for exploring unconventional magnetic states. The de…
Quantum-critical properties of the one- and two-dimensional random transverse-field Ising model from large-scale quantum Monte Carlo simulations
C. Krämer, J. A. Koziol, A. Langheld +2
We study the ferromagnetic transverse-field Ising model with quenched disorder at in one and two dimensions by means of stochastic series expansion quantum Monte Carlo simu…
Monte Carlo based techniques for quantum magnets with long-range interactions
P. Adelhardt, J. A. Koziol, A. Langheld +1
Long-range interactions are relevant for a large variety of quantum systems in quantum optics and condensed matter physics. In particular, the control of quantum-optical platforms…
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…
Quantum robustness of the toric code in a parallel field on the honeycomb and triangular lattice
V. Kott, M. Mühlhauser, J. A. Koziol +1
We investigate the quantum robustness of the topological order in the toric code on the honeycomb lattice in the presence of a uniform parallel field. For a field in -direction,…
Order-by-disorder in the antiferromagnetic -- transverse-field Ising model on the ruby lattice
A. Duft, J. A. Koziol, P. Adelhardt +2
We investigate the quantum phase diagram of the -- antiferromagnetic transverse-field Ising model on the ruby lattice. In the low-field limit we derive an effective…
Quantum phases of hardcore bosons with repulsive dipolar density-density interactions on two-dimensional lattices
J. A. Koziol, G. Morigi, K. P. Schmidt
We analyse the ground-state quantum phase diagram of hardcore Bosons interacting with repulsive dipolar potentials. The bosons dynamics is described by the extended-Bose-Hubbard Ha…
Systematic Analysis of Crystalline Phases in Bosonic Lattice Models with Algebraically Decaying Density-Density Interactions
J. A. Koziol, A. Duft, G. Morigi +1
We propose a general approach to analyse diagonal ordering patterns in bosonic lattice models with algebraically decaying density-density interactions on arbitrary lattices. The ke…
Scaling at quantum phase transitions above the upper critical dimension
A. Langheld, J. A. Koziol, P. Adelhardt +2
The hyperscaling relation and standard finite-size scaling (FSS) are known to break down above the upper critical dimension due to dangerous irrelevant variables. We establish a co…
Quantum-critical properties of the long-range transverse-field Ising model from quantum Monte Carlo simulations
J. Koziol, A. Langheld, S. C. Kapfer +1
The quantum-critical properties of the transverse-field Ising model with algebraically decaying interactions are investigated by means of stochastic series expansion quantum Monte…
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…
Quantum criticality of the transverse-field Ising model with long-range interactions on triangular-lattice cylinders
J. Koziol, S. Fey, S. C. Kapfer +1
To gain a better understanding of the interplay between frustrated long-range interactions and zero-temperature quantum fluctuations, we investigate the ground-state phase diagram…