Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)

TT 24.12: Vortrag

Dienstag, 17. März 2020, 12:30–12:45, HSZ 304

Phase Diagram of the Breathing Kagome 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 phase diagram of the breathing kagome S=1/2 XY model with four-site ring exchange. This model exhibits trimerization of the nearest neighbor exchange between up-/downward oriented triangles of the kagome lattice. This may be of relevance to compounds like vanadium oxyfluoride [NH4]2[C7H14N][V7O6F18].

Though a frustrated quantum spin model, it does not suffer from the sign problem and therefore can be treated by quantum Monte Carlo. In particular, we use the stochastic series expansion method which is extended to treat four-site ring exchange terms residing on the up to next nearest neighbor bow-tie plaquettes by using an update procedure proposed by Roger G. Melko and Anders W. Sandvik [Phys. Rev. E 72, 026702].

Results for the spin stiffness will be presented in order to study the quantum phase transition belonging to the 3D XY universality class.

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