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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Theory I

TT 36.4: Talk

Wednesday, March 20, 2024, 10:15–10:30, H 3005

Bogoliubov-Fermi Surfaces in 2D heterostructures — •Julia Link and Carsten Timm — TU Dresden, Germany

A characteristic feature of the superconducting state in BCS theory is the appearance of a full gap in the quasiparticle spectrum. Under various conditions, one can instead obtain an exotic form of superconductivity for which the superconducting gap contains Bogoliubov Fermi surfaces (BFSs). A BFS is a d−1-dimensional surface of zero-energy states in the d-dimensional momentum space. BFSs were recently observed in the two-dimensional heterostructure Al-InAs in an applied in-plane magnetic field [1]. In this talk, we present the theoretical prediction for the density of states of such a system and predict the temperature dependence of observables such as the heat capacity and the superfluid density in the presence of BFSs.

[1] Phan et al., Phys. Rev. Lett. 128 (2022) 10770