Dresden 2020 – wissenschaftliches Programm

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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 Eljaouhari1,2, Sébastien Burdin2, and Gertrud Zwicknagl11Institut 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.

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