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TT: Fachverband Tiefe Temperaturen

TT 5: Poster Session: Superconductivity

TT 5.2: Poster

Montag, 27. September 2021, 13:30–16:00, P

Substrate enhanced superconductivity in layered materials — •Yann in ’t Veld¹, Roelof Groenewald², Jan Berges³, Stephan Haas², Mikhail Katsnelson¹, Tim Wehling³, Ryotaro Arita⁴, and Malte Rösner¹ — ¹Radboud University, Nijmegen, The Netherlands — ²University of Southern Calidornia, Los Angeles, USA — ³Universität Bremen, Bremen, Germany — ⁴University of Tokyo, Tokyo, Japan

External dielectric screening can be used to efficiently tune the Coulomb interaction and plasmonic excitations in layered materials. At the same time, two-dimensional plasmons couple strongly to electrons due to their gapless square-root-like dispersion, which renders them particularly interesting for tunable superconductivity in layered materials. Here, we extend density functional theory for superconductors (SC-DFT) to account for both the full dynamic Coulomb interaction and phonon contributions in two dimensions. We apply this scheme to monolayer MoS₂ and find that external screening indeed strongly enhances the superconducting critical temperature in the low-doping regime.