Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 21: Topological Semimetals 1

TT 21.4: Talk

Tuesday, March 17, 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 Gnezdilov^1,2,3, Dirk Wulferding^1,2, •Peter Lemmens^1,2, 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)