Enhancing superconductivity with resonant antishielding and topological plasmon-polarons
Krzysztof Kempa, Nakib H. Protik, Tyler Dodge, Claudia Draxl, Michael J. Naughton
DOI 10.1103/PhysRevB.107.184518 · Physical Review B
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Abstract
By employing ab initio Migdal-Eliashberg calculations, we predict a fourfold enhancement of the superconducting critical temperature of MgB2 when proximity-coupled to the topological crystal Bi2Se3. We support this result with calculations using the general Leavens scaling method. We show that this effect is a result of dynamic resonant antishielding of Cooper pairs by plasmon-polarons of Dirac electrons in the topological crystal. Our calculations show that such superconductivity enhancement varies strongly with Coulomb coupling between plasmon- polarons and Cooper pairs, with a pronounced maximum of Tc at a critical value of the coupling parameter. This feature is universal, and so can occur in other superconductor-topological crystal combinations, including with nonphonon mediated superconductors. We discuss methods to experimentally optimize the key coupling parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
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