Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: PtBi2 and Weyl Superconductors
TT 45.3: Talk
Wednesday, March 20, 2024, 12:00–12:15, H 3010
A puzzling superconducting weyl semimental: band structure and effective model of PtBi2 — •Riccardo Vocaturo1, Klaus Koepernic1, Jorge Facio2, Cosma Fulga1, Oleg Janson1, and Jeroen van den Brink1 — 1Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Centro Atomico Bariloche, Instituto de Nanociencia y Nanotecnologia (CNEA-CONICET) and Instituto Balseiro, Av. Bustillo, 9500, Argentina
Weyl semi-metals are interesting phases of matter where topological crossings in the bulk band-structure dictates the presence of protected surface states, i.e. Fermi arcs. Recently, theoretical and experimental works have been suggesting a possible interplay between this features and the presence of superconductivity, both in the bulk and at the surface. In this study we focuses on Trigonal-PtBi2, an inversion-breaking type-I Weyl semimetal, known for its intriguing superconducting properties and distinctive metallic phase. For instance, despite reports of high-Tc superconductivity on the surface and robust BKT transition in think flakes, bulk-PtBi2 is found to be a sub-Kelvin superconductor, posing several theoretical question. In this work, we perform DFT calculations to analyze its electronic structure and surface states. Additionally, we propose a minimal tight-binding model able to reprocisde the number and distribution of Weyl points, preserving the all the crystal symmetries, which we believe to be very helpful in reducing the complexity of this system.
Keywords: Van der Wals; weyl-semimetal; superconductivity; surface superconductivity; topology