Conveners
(DCMMP) M1-7 Quantum Magnetism | Magnétisme quantique (DPMCM)
- Robert Wickham
Skyrmions are a topologically non-trivial magnetic state that has been observed in several different magnetic materials, such as the chiral cubic magnets Cu2OSeO3, FeGe, and MnSi. In these non-centrosymmetric systems, competition between the symmetric exchange interaction and Dzyaloshinskii-Moriya interaction results in the formation of incommensurate spin textures, such as the vortex-like...
The properties of heavy 5d transition metal oxides, such as iridates and osmates, are often remarkably different from those of their lighter 3d counterparts. In particular, the presence of strong spin-orbit coupling (SOC) in these compounds can give rise to a variety of exotic quantum states, including spin-orbital Mott insulators, topological insulators, Weyl semimetals, and quantum spin...
We present the results of a finite-temperature study of a Heisenberg-Dzyaloshinskii-Moriya Hamiltonian on AB-stacked kagome bilayers. We develop an exact analytical coarse-graining procedure to map the microscopic Hamiltonian onto a generalized XY model on a triangular lattice. To leading order, the effective XY model includes both bilinear and biquadratic interactions. In a large portion of...
The Heisenberg-compass model on a square lattice offers a simple example of a frustrated magnet that exhibits the phenomenon of order by disorder (ObD). In this system the ordering direction is selected by quantum zero-point fluctuations for much of the phase diagram, providing a minimal context to explore manifestations of ObD, such as the presence of a pseudo-Goldstone gap. We explore the...
