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EnglishWe 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.
| Titolo: | Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond |
| Autori: | |
| Data di pubblicazione: | 2021 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.apsusc.2020.147723 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Romanin Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond Appl. Surf. Sci. 536, 147723 (2021).pdf | Articolo principale - versione editoriale | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
| SURFINT2019_Piatti_post_print.pdf | Articolo principale - post print | 2. Post-print / Author's Accepted Manuscript |  | Embargo: 04/09/2022 Richiedi una copia |
http://hdl.handle.net/11583/2845817
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