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5 papers · 2 filters
Spin liquid and quantum phase transition without symmetry breaking in a frustrated three-dimensional Ising model
J. Roechner, L. Balents, K. P. Schmidt
We show that the highly frustrated transverse-field Ising model on the three-dimensional pyrochlore lattice realizes a first-order phase transition without symmetry breaking betwee…
Non-perturbative linked-cluster expansions in long-range ordered quantum systems
D. Ixert, K. P. Schmidt
We introduce a generic scheme to perform non-perturbative linked cluster expansions in long-range ordered quantum phases. Clusters are considered to be surrounded by an ordered ref…
Time-dependent correlations in quantum magnets at finite temperature
B. Fauseweh, F. Groitl, T. Keller +4
In this article we investigate the time dependence of the gap mode of copper nitrate at various temperatures. We combine state-of-the-art theoretical calculations with high precisi…
Minimal model for the frustrated spin ladder system BiCuPO
Leanna Splinter, Nils A. Drescher, Holger Krull +1
To establish the microscopic model of the compound BiCuPO is a challenging task. Inelastic neutron scattering experiments showed that the dispersion of this material is non…
Exchange couplings for Mn ions in CdTe: validity of spin models for dilute magnetic II-VI semiconductors
Thorben Linneweber, Jörg Bünemann, Ute Löw +2
We employ density-functional theory (DFT) in the generalized gradient approximation (GGA) and its extensions GGA+ and GGA+Gutzwiller to calculate the magnetic exchange couplings…