Nanofilms as quantum-engineered multiband superconductors: The Ginzburg-Landau theory
1 Departement Fysica, Universiteit Antwerpen - Groenenborgerlaan 171, B-2020 Antwerpen, Belgium, EU
2 Institut für Theoretische Physik III, Bayreuth Universität - Bayreuth D-95440, Germany, EU
Received: 1 February 2013
Accepted: 9 April 2013
Recently fabricated single-crystalline atomically flat metallic nanofilms are in fact quantum-engineered multiband superconductors. Here the multiband structure is dictated by the nanofilm thickness through the size quantization of the electron motion perpendicular to the nanofilm. This opens the unique possibility to explore superconductivity in well-controlled multi-band systems. However, a serious obstacle is the absence of a convenient and manageable theoretical tool to access new physical phenomena in such quasi–two-dimensional systems, including interplay of quantum confinement and fluctuations. Here we cover this gap and construct the appropriate multiband Ginzburg-Landau functional for nano-thin superconductors.
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.78.Na – Mesoscopic and nanoscale systems / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© EPLA, 2013