Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.15: Poster

Wednesday, March 18, 2020, 15:00–18:00, P3

Sub-wavelength THz measurements of small crystals: chiral Ni₃TeO₆ — •David Maluski¹, Malte Langenbach¹, David Szaller², István Kézsmárki³, Vladimir Tsurkan³, Sang-Wook Cheong⁴, Joachim Hemberger¹, and Markus Grüninger¹ — ¹II. Physikalisches Institut, Universität zu Köln — ²Institut für Festkörperphysik, Technische Universität Wien — ³Experimentalphysik V, Universität Augsburg — ⁴Department of Physics and Astronomy Rutgers, The State University of New Jersey

For single crystals with dimensions in the mm range, THz spectroscopy faces the problem of diffraction when the wavelength becomes comparable to the sample size. For instance, the transmitted intensity is significantly suppressed with increasing wavelength, hampering a quantitative analysis. We show, however, that the phase of the photons reaching the detector still can be analysed quantitatively, extending the accessible range for THz spectroscopy to lower frequencies. As an example, we study a single domain of chiral Ni₃TeO₆ with circularly polarized light in high magnetic field, establishing the existence of directional dichroism. This effect can be attributed to the chiral and polar structure and the large dynamic magneto-electric susceptibility.