Dresden 2020 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)
MA 37.5: Vortrag
Mittwoch, 18. März 2020, 16:15–16:30, HSZ 304
Energy dynamics in the Kitaev quantum spin liquid at finite temperature and momentum — •Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, D-38106, Braunschweig, Germany
The role of finite temperature and momentum in the energy dynamics of the two-dimensional Kitaev spin-model on the honeycomb lattice are studied. Fractionalization of magnetic moments into mobile Majorana matter and a static Z2 gauge field lead to a continuum of energy density modes comprising two channels. Thermal flux excitations, which act as an emergent disorder, strongly affect the dynamical energy susceptibility. Above the flux proliferation temperature, coherent energy propagation is modified into a quasi hydrodynamic density relaxation, the temperature and momentum dependence of which is analyzed. Results from the low-temperature homogeneous gauge and a mean-field treatment of thermal gauge fluctuations, valid at intermediate and high temperatures are considered.