Dresden 2020 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 63: Quantum Magnets and Molecular Magnets (joint session TT/MA)
TT 63.8: Vortrag
Donnerstag, 19. März 2020, 17:15–17:30, HSZ 304
Quantum phase transitions of Ising ferromagnets in tilted transverse fields — •Heike Eisenlohr and Matthias Vojta — Institut für theoretische Physik, Technische Universität Dresden, Germany
Transverse-field Ising magnets constitute a paradigmatic example for quantum phase transitions, with experimental realisations in e.g. LiHoF4 and CoNb2O6. Here we theoretically analyze the fate of the field-driven zero-temperature transition upon tilting the field away from the direction perpendicular to the easy axis. While the transition turns into a crossover if the ordered phase is single-domain, a sharp transition remains in the multi-domain case relevant for a ferromagnet. We characterize this transition in detail, also discussing effects of domain-wall motion. Upon including nuclear spin degrees of freedom, we are able to link our results to experiments on LiHoF4.