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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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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 Grüninger11II. 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.

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