SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Frustrated Magnets: Strong Spin-Orbit Coupling

TT 52.1: Vortrag

Donnerstag, 30. März 2023, 15:00–15:15, HSZ 201

Finite temperature nonlinear optical response of the Kitaev magnet — •Wolfram Brenig¹ and Olesia Krupnitska^1,2 — ¹Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany — ²Institute for Condensed Matter Physics, NASU, Svientsitskii Str. 1, 79011 Lviv, Ukraine

One of the key properties of a quantum spin liquid is fractionalization. In the spin liquid hosted by the Kitaev model, this occurs in terms of two types of quasiparticles, i.e., itinerant Majorana fermions and localized gapped Z₂ fluxes. A multitude of probes have been suggested to provide evidence for the response and spectral continua related to such fractionalization. Here we report results on the nonlinear optical response of a Kitaev magnet at finite temperature. Our analysis is based on complementary calculations in the low-temperature homogeneous gauge and a mean-field treatment of thermal gauge fluctuations, valid at intermediate and high temperatures.