SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Poster: Superconductivity I

TT 57.17: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2

Analytical parquet renormalization group for multipocket systems — •Nora Taufertshöfer, Matteo Dürrnagel, and Ronny Thomale — Theoretische Physik I, Universität Würzburg

Materials with multi-pocket fermiology may exhibit unconventional superconductivity which arises from inter-pocket scattering. Studying this problem in the weak coupling regime by renormalization group (RG) methods requires a perturbative expansion in each flow step.

As electronically driven instabilities are predominantly governed by states close to the Fermi surface, the RG analysis can be restricted to a few distinct momentum channels between the Fermi pockets. The parquet RG [1] embeds the truncation of the flow equations into a rigorous analytical scheme to investigate superconductivity and its interplay with various competing phases. Within this framework we discuss the relevance of nematic fluctuations in a 2D model for GaAs/AlAs heterostructures, which may host the possibility for gate-tunable unconventional superconductivity [2].
[1] S. Maiti and A. V. Chubukov, Phys. Rev. B 82, 214515 (2010)
[2] A. V. Chubukov and S. A. Kivelson, Phys. Rev. B 96, 174514 (2017)