Nanoarchitecture: Toward Quantum-Size Tuning of Superconductivity.

Physica Status Solidi - Rapid Research Letters. 2019. No. 1800317. P. 1–5.

Arutyunov K., Zavialov Vitalii, Sedov E., Golokolenov I., Заруднева А. А., Shein K., Trun’kin I., Vasiliev A., Konstantinidis G., Stavrinidis G., Croitoru M., Shanenko 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.
 

Keywords: superconductivity, сверхпроводимость, nanofilms, нанопленки, quantum‐size effects, Квантоворазмерные эффекты

Publication based on the results of: Quanhtum solid state systems (2018)