The road map toward room temperature superconductivity: manipulating different pairing channels in systems composed of multiple electronic components

TL;DR

This paper explores a theoretical pathway to achieve room temperature superconductivity by manipulating pairing channels in multicomponent electronic systems, focusing on a polaronic component near a Lifshitz transition.

Contribution

It introduces a novel multiband superconductivity model combining a vanishing Fermi velocity component with a high Fermi velocity component, aiming to optimize Tc amplification.

Findings

Optimal coupling enhances Tc significantly.

Lifshitz transition proximity boosts superconductivity.

Multicomponent systems outperform single-component ones.

Abstract

While it is known that the amplification of the superconducting critical temperature Tc is possible in a system of multiple electronic components in comparison with a single component system, many different road maps for room temperature superconductivity have been proposed for a variety of multicomponent scenarios. Here we focus on the scenario where the first electronic component is assumed to have a vanishing Fermi velocity corresponding to a case of the intermediate polaronic regime, and the second electronic component is in the weak coupling regime with standard high Fermi velocity using a mean field theory for multiband superconductivity. This roadmap is motivated by compelling experimental evidence for one component in the proximity of a Lifshitz transition in cuprates, diborides and iron based superconductors. By keeping a constant and small exchange interaction between the two electron fluids, we search for the optimum coupling strength in the electronic polaronic component which gives the largest amplification of the superconducting critical temperature in comparison with the case of a single electronic component.