Semiclassical theory of shot noise in disordered SN contacts

Дата и время публикации : 2000-07-07T07:40:00Z

Авторы публикации и институты :
K. E. Nagaev
M. Buttiker

Ссылка на журнал-издание: Phys. Rev. B 63, 081301(R) (2001)
Коментарии к cтатье: 4 pages RevTeX, 1 eps figure
Первичная категория: cond-mat.mes-hall

Все категории : cond-mat.mes-hall, cond-mat.supr-con

Краткий обзор статьи: We present a semiclassical theory of shot noise in diffusive superconductor – normal metal contacts. At subgap voltages, we reproduce the doubling of shot noise with respect to conventional normal-metal contacts, which is interpreted in terms of an energy balance of electrons. Above the gap, the voltage dependence of the noise crosses over to the standard one with a voltage-independent excess noise. The semiclassical description of noise leads to correlations between currents at different electrodes of multiterminal SN contacts which are always of fermionic type, i.e. negative. Using a quantum extension of the Boltzmann – Langevin method, we reproduce the peculiarity of noise at the Josephson frequency and obtain an analytical frequency dependence of noise at above-gap voltages.

Category: Physics