Low Temperature Physics: 38, 345 (2012); https://doi.org/10.1063/1.3697969 (4 pages)
Transport characteristics of mesoscopic tunnel structures: transition from quantum to classical limit
Physical Engineering Department, National Technical Institute "KhPI" 21 Frunze Str., Kharkiv 61002, Ukraine
I.V. Boylo, and M.A. Belogolovskii
A.A. Galkin Donetsk Physico-Technical Institute, National Аcademy of Sciences of Ukraine 72 R. Luxembourg Str., Donetsk 83114, Ukraine
Received Octouber 17, 2011
Two possible mechanisms of partial or complete loss of information encoded in the quantummechanical phase of an electron moving in a stochastic solid-state structure are considered. The first one is the phase randomization of electronic characteristics (e.g. due to elastic scatterings of carriers by defects in thin metal layers) and the second one appears due to inelastic interactions of carriers with external degrees of freedom. The double-barrier heterostructure taken, as an example shows that in the first case, the quantum description reduces to a semi-classical approach, in which the probability amplitudes are replaced by corresponding probabilities of some events, and the second case corresponds to the transition to the classical charge-transport theory. The effect of decoherence on differential conductance and shot noise in double-barrier systems with a superconducting electrode is calculated, and their changes caused by the transition from quantum to classical incoherent regime of electron transport are analyzed.
PACS: 73.23.–b Electronic transport in mesoscopic systems;
Key words: mesoscopic multilayered structures, charge transport, tunneling into superconductors, decoherence.