Feshbach Shape Resonance for High Tc Pairing in Superlattices of Quantum Stripes and Quantum Wells

TL;DR

This paper proposes that Feshbach shape resonances in interband pairing within superconducting superlattices of quantum wells or stripes can significantly enhance Tc, with the architecture tuning the chemical potential to a Van Hove singularity.

Contribution

It introduces a new mechanism for high Tc superconductivity based on Feshbach shape resonances in superlattice structures, linking material architecture to Tc enhancement.

Findings

Feshbach shape resonances enable high Tc superconductivity.

Superlattice architecture tunes the chemical potential to a Van Hove singularity.

Interband pairing is key to the proposed mechanism.

Abstract

The Feshbach shape resonances in the interband pairing in superconducting superlattices of quantum wells or quantum stripes is shown to provide the mechanism for high Tc superconductivity. This mechanism provides the Tc amplification driven by the architecture of material: superlattices of quantum wells (intercalated graphite or diborides) and superlattices of quantum stripes (doped high Tc cuprate perovskites) where the chemical potential is tuned to a Van Hove-Lifshitz singularity (vHs) in the electronic energy spectrum of the superlattice associated with the change of the Fermi surface dimensionality in one of the subbands.