Shape-Resonant Superconductivity in Nanofilms: from Weak to Strong Coupling |
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Authors: | Marco Cariglia Alfredo Vargas-Paredes Mauro M. Doria Antonio Bianconi Milorad V. Milošević Andrea Perali |
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Affiliation: | 1.Departamento de Física,Universidade Federal de Ouro Preto,Ouro Preto,Brazil;2.School of Pharmacy, Physics Unit,University of Camerino,Camerino,Italy;3.Departement Fysica,Universiteit Antwerpen,Antwerpen,Belgium;4.Instituto de Física,Universidade Federal do Rio de Janeiro,Rio de Janeiro,Brazil;5.Rome International Center for Materials Science Superstripes (RICMASS),Rome,Italy;6.INFN Sezione di Perugia,Perugia,Italy |
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Abstract: | Ultrathin superconductors of different materials are becoming a powerful platform to find mechanisms for enhancement of superconductivity, exploiting shape resonances in different superconducting properties. Here, we evaluate the superconducting gap and its spatial profile, the multiple gap components, and the chemical potential, of generic superconducting nanofilms, considering the pairing attraction and its energy scale as tunable parameters, from weak to strong coupling, at fixed electron density. Superconducting properties are evaluated at mean field level as a function of the thickness of the nanofilm, in order to characterize the shape resonances in the superconducting gap. We find that the most pronounced shape resonances are generated for weakly coupled superconductors, while approaching the strong coupling regime the shape resonances are rounded by a mixing of the subbands due to the large energy gaps extending over large energy scales. Finally, we find that the spatial profile, transverse to the nanofilm, of the superconducting gap acquires a flat behavior in the shape resonance region, indicating that a robust and uniform multigap superconducting state can arise at resonance. |
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