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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.5: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, HSZ 204

Quasiparticle bands in the locally non-centrosymmetric heavy-fermion CeRh₂As₂ — •Évrard-Ouicem Eljaouhari^1,2, Sébastien Burdin², and Gertrud Zwicknagl¹ — ¹Institut für Mathematische Physik, Technische Universität Braunschweig, Germany — ²LOMA, Université de Bordeaux, France

In the study of heavy-fermion materials, non-centrosymmetric ones have gained much interest in the past decade. Indeed, their lack of inversion symmetry in combination with strong spin-orbit coupling (SOC) and magnetic interactions can lead to the emergence of novel phenomena such as unvoncentional superconductivity and quantum phase transitions.

Of particular significance is the new non-centrosymmetric heavy-fermion CeRh₂As₂ for which some interesting properties have been reported. For example, measurements have shown the existence of a quasi-quartet crystal electric field (CEF) ground state which would normally not be expected in a tetragonal system. Also and as for other non-centrosymmetric superconductors, a Rashba-type SOC which leads to the splitting of the Fermi surface into two and to the possibility of mixing singlet-triplet superconducting states is expected.

In order to get deeper understanding of this compound and its properties, a realistic modeling of its electronic structure is needed. In this talk we present our results on the quasiparticle bands of CeRh₂As₂ which have been calculated thanks to the Renormalised Band method which proceeds from a relativistic description of the electronic structure and accounts for CEF effects and for the mass renormalisation.