Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.6: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Magnetic properties of the Breathing Kagome Lattice S=1/2 XY Model with Four-Site Ring Exchange — •Niklas Casper and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, Germany
We study the magnetic properties of the breathing kagome lattice S=1/2 XY model with four-site ring exchange. In this trimerized variation, spins which belong to upward or downward facing triangles have different coupling strengths. This model may be of relevance to synthesized vanadium oxyfluoride compound [NH4]2[C7H14N][V7O6F18] (DQVOF). Even though it is a frustrated quantum spin model, it does not suffer from the infamous sign problem and can be treated by Quantum Monte Carlo (QMC). In particular, we use the stochastic series expansion (SSE) method which is extended by including a four-site ring exchange term that flips spins on a square plaquette using an update procedure proposed by [1]. Results for thermodynamic properties as well as the structure factor will be presented.
R. G. Melko and A. W. Sandvik, Phys. Rev. E 72, 026702