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TT: Fachverband Tiefe Temperaturen

TT 41: Topological Semimetals

TT 41.4: Vortrag

Mittwoch, 11. März 2026, 10:15–10:30, HSZ/0103

Raman spectroscopic evidence for linearly dispersed nodes and magnetic ordering in the topological semimetal V_1/3NbS₂ — •Shreenanda Ghosh^1,2, Chris Lygouras¹, Zili Feng³, Mingxuan Fu³, Satoru Nakatsuji^1,3, and Natalia Drichko¹ — ¹Institute for Quantum Matter and William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, USA — ²Institute of Physics, University of Münster, Germany — ³Department of Physics, University of Tokyo, Japan

We report polarization-resolved magnetic and electronic Raman scattering of the intercalated transition metal dichalcogenide V_1/3NbS₂, proposed as a Weyl semimetal [1,2]. The electronic scattering reveals a linear with frequency continuum of excitations, as the signature of electronic transitions within the proposed Weyl nodes in a 2D electronic structure [3]. Additionally, two-magnon excitations of V moments are observed near 15 meV in the magnetically ordered phase below 50 K[3], which are well reproduced by calculations using spin wave exchange parameters [4] and confirm the antiferromagnetic character of the order. These magnetic and electronic scattering, observed in the same spectra, provide independent spectroscopic evidence for a collinear antiferromagnetic Weyl semimetal state in V_1/3NbS₂.
[1] M. K. Ray et al., Nat Com 16, 3532 (2025).
[2] H. Wang et al., Phys. Rev. B 107, 134436 (2023).
[3] S. Ghosh et al., arXiv:2504.04590 (2025).
[4] K. Lu et al., Phys. Rev. Mat 4, 054416 (2020).

Keywords: Raman scattering spectroscopy; Collinear antiferromagnets; Weyl semimetals; Two-magnon Raman scattering; electronic Raman scattering