Non-gapless excitation and zero-bias fast oscillations in the LDOS of surface superconducting states

Chen, Liangyuan; Chen, Yajiang; Zhang, Wenhui; Zhou, Shanyu

doi:10.1016/j.physb.2022.414302

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…Let us consider a 1D chain of atoms with the s-wave pairing of electrons in the system and adopt the attractive Hubbard model within the tight-binding approximation. The related BdG equations can be written as [14][15][16][17][18]…”

Section: Theoretical Formalismmentioning

confidence: 99%

“…However, recently it was found within the BdG equations for the Hubbard attractive model with the nearest-neighbor hopping that the relative difference between T cs and T cb can increase up to 20-25%, and this increase was attributed to the formation of boundary pair states with elevated critical temperatures [14]. Later it was shown [15,16] that in fact, the enlargement of the surface critical temperature is caused by the constructive interference of the bulk pair states near the sample surface. Such a constructive interference was found to be most pronounced when the conduction band is symmetric with respect to the Fermi level (the half-filling case).…”

Section: Introductionmentioning

confidence: 99%

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Interference-induced surface superconductivity: Enhancement by tuning the Debye energy

et al. 2023

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In the usual perception, surface superconductivity is associated with the surface nucleation of a superconducting condensate above the upper critical field in type-II superconductors or with a rearrangement of phonon properties and the electron-phonon coupling near surfaces/interfaces. Recently, it has been found that there is another example when the surface superconducting temperature is increased up to 20-25% as compared to the bulk one due to constructive interference of superconducting pair states. In the present work, we demonstrate that in fact, such an interferenceinduced enhancement can be much more pronounced, up to nearly 70%. Furthermore, here it is shown that such an interference enhancement persists over a wide range of microscopic parameters.

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