SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Focus Session: Unconventional Transport Phenomena in Low-Dimensional Superconducting Heterostructures

TT 27.7: Vortrag

Mittwoch, 29. März 2023, 12:00–12:15, HSZ 03

Plasmons and dynamical screening in layered superconducting heterostructures — •Yann in 't Veld¹, Mikhail Katsnelson¹, Andrew Millis^2,3, and Malte Rösner¹ — ¹Radboud University, Nijmegen, the Netherlands — ²Flatiron Institute, New York, USA — ³Columbia University, New York, USA

Layered metals host low-energetic plasmonic and phononic excitations, which both strongly couple to electrons. At the same time these excitations hybridize with each other, which can be tuned by the surrounding material, resulting in a complex interplay of different bosons. Here we investigate how this interplay affects superconductivity in layered materials and how it is affected by the substrate material. To this end we use a one-loop theory which consistently treats phonons, plasmons, their mutual interaction and environmental screening on the same footing. We find two regimes with large transition temperatures, controlled by the substrate screening. One is mediated by conventional phonon pairing, which shows a significantly reduced transition temperature due to consistent screening. The other regime is dominated by the unconventional electron-plasmon interaction, where we find strong effects of normal-state renormalization on the superconducting state. These results show how crucial a consistent treatment of all pairing and screening channels is for low-dimensional superconductivity.