Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Topological Semimetals II

TT 51.9: Vortrag

Mittwoch, 20. März 2024, 17:00–17:15, H 3007

Role of Quantum Geometry on Spin Fluctuations and Pairing in Chiral Superconductors — •Niclas Heinsdorf and Andreas Schnyder — Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany

Recently the B20 Weyl Semimetal RhGe has been proposed to be a topological superconductor. Chiral symmetries enforce multi-fold topological band crossings in the bulk band structure of the material's normal state and strongly enhance the quantum geometry in its proximity. The imaginary part of the quantum geometry, the Berry curvature, is well-known to result in exotic transport properties such as circular photogalvanic or spin Nernst effect, whereas its real part, the Fubini-Study metric, has been shown to favor ferromagnetic spin fluctuations. Using effective modeling and random phase approximation, we separate the effective interactions into effective mass and topological contributions, analyze the effect of quantum-geometry on the pairing and gap symmetry and discuss the presence of multipole order for RhGe and chiral superconductors in general.

Keywords: superconductivity; quantum geometry; semimetal; topology; chiral