We perform single- and multi-band Migdal-Eliashberg (ME) calculations with parameters exctracted from density functional theory (DFT) simulations to study superconductivity in the electric-field-induced 2-dimensional hole gas at the hydrogenated (111) diamond surface. We show that according to the Eliashberg theory it is possible to induce a high-Tc superconducting phase when the system is field-effect doped to a surface hole concentration of 6x10^14 cm^−2, where the Fermi level crosses three valence bands. Starting from the band-resolved electron-phonon spectral functions alpha^(2)F_(jj')(w) computed ab initio, we iteratively solve the self-consistent isotropic Migdal-Eliashberg equations, in both the single-band and the multi-band formulations, in the approximation of a constant density of states at the Fermi level. In the single-band formulation, we find Tc≈40 K, which is enhanced between 4% and 8% when the multi-band nature of the system is taken into account. We also compute the multi-band-sensitive quasiparticle density of states to act as a guideline for future experimental works

Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond / Romanin, Davide; Ummarino, Giovanni; Piatti, Erik. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - STAMPA. - 536:(2021), p. 147723. [10.1016/j.apsusc.2020.147723]

Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond

Davide Romanin;Giovanni Ummarino;Erik Piatti
2021

Abstract

We perform single- and multi-band Migdal-Eliashberg (ME) calculations with parameters exctracted from density functional theory (DFT) simulations to study superconductivity in the electric-field-induced 2-dimensional hole gas at the hydrogenated (111) diamond surface. We show that according to the Eliashberg theory it is possible to induce a high-Tc superconducting phase when the system is field-effect doped to a surface hole concentration of 6x10^14 cm^−2, where the Fermi level crosses three valence bands. Starting from the band-resolved electron-phonon spectral functions alpha^(2)F_(jj')(w) computed ab initio, we iteratively solve the self-consistent isotropic Migdal-Eliashberg equations, in both the single-band and the multi-band formulations, in the approximation of a constant density of states at the Fermi level. In the single-band formulation, we find Tc≈40 K, which is enhanced between 4% and 8% when the multi-band nature of the system is taken into account. We also compute the multi-band-sensitive quasiparticle density of states to act as a guideline for future experimental works
File in questo prodotto:
File Dimensione Formato  
Romanin Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond Appl. Surf. Sci. 536, 147723 (2021).pdf

non disponibili

Descrizione: Articolo principale - versione editoriale
Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 3.46 MB
Formato Adobe PDF
3.46 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
SURFINT2019_Piatti_post_print.pdf

Open Access dal 05/09/2022

Descrizione: Articolo principale - post print
Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Creative commons
Dimensione 1.82 MB
Formato Adobe PDF
1.82 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2845817