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TT: Fachverband Tiefe Temperaturen
TT 21: Topological Semimetals 1
TT 21.4: Vortrag
Dienstag, 17. März 2020, 10:15–10:30, HSZ 103
Resonance Raman scattering and magnetic-field tuning of the electronic band structure in the topological semimetal PdGa — Vladimir Gnezdilov1,2,3, Dirk Wulferding1,2, •Peter Lemmens1,2, Florian Büscher1, Yurii Pashkevich4, Tanya Shevtsova4, Claudia Felser5, and Kaustuv Manna5 — 1IPKM, TU-BS, Braunschweig, Germany — 2LENA, TU-BS, Braunschweig, Germany — 3ILTPE Kharkov, Ukraine — 4Galkin DonFTI, Kyiv, Ukraine — 5MPI Dresden, Germany
The novel chiral topological semimetal PdGa is the first known compound where electronic bands acquire a maximal Chern number of C = ± 4 [1]. Using Raman spectroscopy, we uncover a strong and sharp electronic resonance around E = 2.35 eV that allow us to follow changes of electronic Raman scattering occurring in moderate magnetic fields as well as phonon anomalies. Both observations point to a possible modification of the electronic band structure in PdGa in magnetic fields.
Work supported by DFG LE967/16-1 and QUANOMET NL-4.
[1] Schröter et al., arXiv:1907.08723 (2019)