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HL: Fachverband Halbleiterphysik

HL 2: 2D Materials and Heterostructures: Photonic Aspects

HL 2.3: Talk

Monday, March 18, 2024, 10:00–10:15, EW 201

Symmetry and handedness of chiral tellurium under polarized Raman spectroscopy — •Davide Spirito¹, Sergio Marras², and Beatriz Martín García^3,4 — ¹IHP-Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany — ²Istituto Italiano di Tecnologia - Materials Characterization Facility, Genova 16163, Italy — ³CIC nanoGUNE BRTA, 20018 Donostia-San Sebastián, Basque Country, Spain — ⁴IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain

Trigonal tellurium is a model low-dimensional material for the study of electrons and phonons in chiral systems. Here we show how the response of tellurium to polarized light depends on the crystal orientation, which has implication for optical properties and electron transport studies. By linearly polarized Raman spectroscopy we identify different crystal faces and the orientation of the trigonal axis, based on typical patterns derived from the analysis of the symmetry of the crystal. Furthermore, by circularly polarized measurements we determine the handedness only for incidence parallel to the trigonal axis, with the observation of different peaks shift for left- and right-handed crystals. We support our findings with X-ray diffraction and chirality-sensitive chemical etching, providing a robust insight for the analysis chiral and low-dimensional materials.

Keywords: tellurium; chirality; Raman spectroscopy; polarized spectroscopy; symmetry