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he quantum mechanical character of electronic transport is manifest in mesoscopic systems at low temperatures, typically below 1 K. Hybrid mesoscopic structures,
 

Summary: T
he quantum mechanical character of electronic transport is manifest in mesoscopic
systems at low temperatures, typically below 1 K. Hybrid mesoscopic structures,
characterized by small sizes in the range of a few nanometers to micrometers, are
fabricated by putting into contact materials whose transport properties are different in
nature. Superconductors, in particular, are characterized by the macroscopic phase
coherence of the order parameter and by the supercurrent flow. Normal (metallic or
semiconducting)-superconductor (NS) nanostructures show peculiar transport properties
due to the presence of the superconducting gap. In these systems electronic transport is
mediated by Andreev reflection, which is a scattering process occurring at the NS interface. It
consists of the coherent evolution of an electron into a retro-reflected hole and describes the
injection of a Cooper pair into the superconducting condensate.
Our efforts in this field are both on the experimental and theoretical sides, and comprise
different aspects. Here we summarize results obtained in the following topics: i) Andreev
reflection in hybrid ferromagnet-superconductor structures; ii) out-of-equilibrium transport;
iii) influence of quantizing magnetic fields and magnetic barriers on the Andreev reflection.
The first topic concerns ferromagnet- spin-dependent magnetic flux of geometric
superconductor (FS) hybrid systems. These origin (geometric flux) and their magnitude
are an attractive subject of investigation is proportional to the corresponding solid
because of the competition between the angle accumulated by the spins. We have

  

Source: Abbondandolo, Alberto - Scuola Normale Superiore of Pisa

 

Collections: Mathematics