Fermi surface of chiral non-centrosymmetric HfSn2

Chiral structured semimetals have been predicted to host unusual fermionic excitations, such as Dirac, Weyl and Majorana fermions. The lack of both inversion symmetry and mirror symmetry in chiral crystal structures has been predicted to create fermionic excitations with large topological charge, long Fermi-arc surface states and unusual magnetotransport behavior. A recent investigation claims to have observed an electron-phonon liquid in chiral hexagonal structured material NbGe2 [1].

We have measured single crystals of HfSn2, a very recently synthesized material isostructural to NbGe2. We present the results of pulsed-field magnetometry measurements on this material in fields up to 50 tesla and temperatures down to 1.5 K, performed in the Nicholas Kurti High Magnetic Field Laboratory at the University of Oxford. The data reveal a rich spectra of de Haas-van Alphen oscillations. In this talk, we will discuss the observed frequencies and amplitudes of these oscillations as a function of field and temperature, as well as the implications of these results for the Fermi surface of HfSn2 and its electronic properties.

[1] Hung-Yu Yang et al., Nature Communications 12, 5292 (2021)