Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session F05: Field Induced Phenomena in Alpha-RuCl3
11:15 AM–2:15 PM,
Tuesday, March 6, 2018
LACC Room: 152
Sponsoring Units: DCMP DMP GMAG
Chair: George Jackeli, Univ Stuttgart
Abstract: F05.00005 : Heisenberg-Kitaev physics in magnetic fields
1:39 PM–2:15 PM
View Presentation Abstract
α-RuCl3 is a Mott insulator in the regime of strong spin-orbit coupling. In this material, the effective degrees of freedom are localized spins on a two-dimensional honeycomb lattice. They interact via strongly direction-dependent exchange couplings and, under a suitable external perturbation, may realize Kitaev's celebrated honeycomb spin model. When subject to a magnetic field, recent experiments in fact appear to suggest a field-induced quantum spin liquid characterized by fractionalized Majorana excitations. I will describe and explain the behavior of the relevant extended Heisenberg-Kitaev spin models in applied magnetic fields. Our results reveal surprisingly rich phase diagrams, with non-trivial intermediate phases including vortex crystals and other multi-Q states. I will discuss possible origins of large magnetic anisotropies as observed experimentally, and highlight different mechanisms to stabilize zigzag magnetic order and their distinct field responses.
 L. Janssen, E. C. Andrade, and M. Vojta, Phys. Rev. B 96, 064430 (2017).
 L. Janssen, E. C. Andrade, and M. Vojta, Phys. Rev. Lett. 117, 277202 (2016).
 A. U. B. Wolter, L. T. Corredor, L. Janssen, K. Nenkov, S. Schönecker, S.-H. Do, K.-Y. Choi, R. Albrecht, J. Hunger, T. Doert, M. Vojta, and B. Büchner, Phys. Rev. B 96, 041405(R) (2017).
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