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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.14: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Investigation of quantum oscillations in the topological chiral semimetal CoSi — •Nico Huber, Grace Causer, Georg Benka, Lukas Worch, Laura Stapf, Andreas Bauer, Marc Wilde, and Christian Pfleiderer — Technical University of Munich, 85748 Garching, Germany

Chiral semimetals are predicted to host massless topological fermions that are distinct from Dirac and Weyl fermions. Ab initio density functional theory (DFT) suggests the existence of such fermions in the transition-metal silicide CoSi.[1] In turn, electron orbits with a chiral charge around the R point in the Brillouin zone were deduced from quantum oscillations in the thermoelectrical properties of this material.[2] We report the results of Shubnikov-de Haas and de Haas-van Alphen measurements of CoSi down to milli-Kelvin temperatures. Our data confirm the oscillation frequencies reported in Ref. [2]. In addition, we performed angle-resolved measurements to determine the influence of the crystallographic orientation on these oscillations. We compare our results with comprehensive DFT calculations.

[1] Peizhe Tang, Quan Zhou, and Shou-Cheng Zhang, Phys. Rev. Lett. 119, 206402 (2017)

[2] Xu et al., Phys. Rev. B 100, 045104 (2019)