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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.17: Poster

Wednesday, March 29, 2023, 15:00–18:00, P2/OG2

Second-harmonic generation in the Kitaev model — •Olesia Krupnitska^1,2 and Wolfram Brenig¹ — ¹Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany — ²Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, 1 Svientsitskii Street, Lviv, 79011, Ukraine

Optical spectroscopies are important probes for elementary excitations of quantum magnets. In the present study, we investigate second-harmonic generation in the hexagonal Kitaev model induced by external electric fields. The prime interest is to identify fingerprints of fractionalization as has been shown to exist in this model in terms of Majorana particles and gauge excitations. For that purpose second order response functions are calculated within the equation of motion approach. Analytical results for the spectrum will be presented in the homogeneous gauge sector and exchange anisotropy and temperatures of Majorana fermions will be analyzed. The impact of gauge flux excitation will be speculated upon.