Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity: Theory

TT 34.11: Talk

Wednesday, March 19, 2025, 17:45–18:00, H36

Emergence of a condensate with finite-energy Cooper pairing in hybrid exciton/superconductor systems — •Viktoriia Kornich — University of Würzburg, Würzburg, Germany

I will consider a setup consisting of excitons formed in two valleys, with proximity-induced Cooper pairing, different in the conduction and valence bands. Due to the combination of a Coulomb interaction within excitons and superconducting proximity effects, Cooper pairing between electrons from valence and conduction bands from different valleys is formed. Thus, the gap between these electrons can be much larger than the usual superconducting pairing energies. This Cooper pairing has both even- and odd-frequency contributions. I will show that there is a phase transition into the formation of a robust macroscopic condensate of such Cooper pairs and then will suggest a detection scheme of it via Higgs modes.

Keywords: condensate, superconductivity, exciton