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92 papers
Ground state properties of the Heisenberg-compass model on the square lattice
Subhankar Khatua, Griffin C. Howson, Michel J. P. Gingras +1
Compass models provide insights into the properties of Mott-insulating materials that host bond-dependent anisotropic interactions between their pseudospin degrees of freedom. In t…
Pseudo-Goldstone modes and dynamical gap generation from order-by-thermal-disorder
Subhankar Khatua, Michel J. P. Gingras, Jeffrey G. Rau
Accidental ground state degeneracies -- those not a consequence of global symmetries of the Hamiltonian -- are inevitably lifted by fluctuations, often leading to long-range order,…
Classical and quantum phases of the pyrochlore magnet with Heisenberg and Dzyaloshinskii-Moriya interactions
Vincent Noculak, Daniel Lozano-Gómez, Jaan Oitmaa +4
We investigate the ground state and critical temperature phase diagrams of the classical and quantum pyrochlore lattice with nearest-neighbor Heisenberg and Dzyaloshinskii-…
Pinch-points to half-moons and up in the stars: the kagome skymap
Dominik Kiese, Francesco Ferrari, Nikita Astrakhantsev +9
Pinch point singularities, associated with flat band magnetic excitations, are tell-tale signatures of Coulomb spin liquids. While their properties in the presence of quantum fluct…
Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11: A single crystal study
Sachith Dissanayake, Zhenzhong Shi, Jeffrey G. Rau +10
Ba3Yb2Zn5O11 is unique among breathing pyrochlore compounds for being in the nearly decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or "mol…
Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere
P. Bergeron, F. Wesemael, G. Fontaine +7
We present optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars. We also per…