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While the maximum critical temperature for superconductivity in pressurized sulfur hydrides appears in the range K at the top of a superconducting dome in the versus pressure P curves, standard superconductivity theories do not predict the superconducting domes. Filling this gap, we provide a first principles quantum calculation of the superconducting dome reaching room temperature for multigap superconductivity driven by the Fano-Feshbach resonance due by configuration interaction between open and closed pairing channels, ie, between multiple gaps, in the BCS regime, resonating with a gap in the BCS-BEC crossover regime. The gap in the BCS-BEC crossover occurs tuning the chemical potential by pressure at a Lifshitz electronic topological transition from an open Fermi surface to a closed disappearing Fermi surface characterized by an asymmetric van Hove singularity. We …
Publication date: 
1 Jun 2021

Maria Vittoria Mazziotti, Roberto Raimondi, Antonio Valletta, Gaetano Campi, Antonio Bianconi

Biblio References: 
Pages: arXiv: 2106.14394
arXiv e-prints