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Regular version of the site

Article

Nanoarchitecture: Toward Quantum-Size Tuning of Superconductivity

Physica Status Solidi RRL, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 2018. No. 1800317. P. 1-5.
Arutyunov K., Sedov E., Golokolenov I., Заруднева А. А., Шеин К. В., Trun’kin I. N., Vasiliev A. L., Konstantinidis G., Stavrinidis A., Stavrinidis G., Croitoru M. D., Shanenko A. A.

Quantum confinement is known to affect a nanosized superconductor
through quantum-size variations of the electronic density of states. Here, it is
demonstrate that there is another quantum-confinement mechanism over-
looked in previous studies. In particular, it is found that the electron–electron
attraction can be enhanced due to quantum-confinement modifications of
electronic wave functions. The superconducting correlations are strengthened
by such quantum mechanical effect, which creates a subtle interplay with
surface–substrate phonon modifications. The combined effect depends on
nanofilm thickness and can be controlled by nanoarchitechture. The
calculations are in a reasonable agreement with experiments performed on
high-quality aluminum films. These findings shed light on the long-standing
problem of the size dependence of the critical temperature in low-
dimensional superconductors.