Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Unconventional Superconductors

TT 24.11: Vortrag

Mittwoch, 19. März 2025, 12:45–13:00, H31

Cause and Effect - Understanding the Fundamental Principles Determining the Gap Structure in Fluctuation Driven Superconductors — •Jonas Profe¹, Olivier Gingras², Antoine Georges^3,2,4,5, and Roser Valenti¹ — ¹Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — ²Center for Computational Quantum Physics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA — ³College de France, 11 place Marcelin Berthelot, 75005 Paris, France — ⁴Centre de Physique Theorique, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France — ⁵DQMP, Universite de Geneve, 24 quai Ernest Ansermet, CH-1211 Geneve, Suisse

Describing and understanding unconventional superconductors is one of the major challenges of modern condensed matter physics. Here, central questions are, what determines which symmetry the superconducting order will have in a material and how can we engineer specific superconducting orders? In this talk, we disentangle how the effective pairing interaction and the electronic structure influence the resulting superconducting order for attractive interactions mediated by fluctuations. For this, we analytically dissect the linearized gap equation in order to extract as much information as possible. We then exemplify how one can utilize this understanding to design models showing specific ordering tendencies in both a single and a multi-orbital setting.

Keywords: Fluctuation driven superconductivity; Symmetry of the order parameter; Sr2RuO4; Multi-band