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Dissipative charge transport in diffusive superconducting double-barrier junctions | | E.V. Bezuglyi
; E.N. Bratus'
; V.S. Shumeiko
; | | Date: |
23 Mar 2011 | | Abstract: | We solve coherent multiple Andreev reflection (MAR) problem and calculate
current-voltage characteristics (IVCs) for Josephson SINIS junctions, where S
are local-equilibrium superconducting reservoirs, I denotes tunnel barriers,
and N is a short diffusive normal wire, whose length is much smaller than the
coherence length, and the resistance is much smaller than the resistance of the
tunnel barriers. The charge transport regime in such junctions qualitatively
depends on a characteristic value gamma = Delta au_d of relative phase
shifts between the electrons and retro-reflected holes accumulated during the
dwell time au_d. In the limit of small electron-hole dephasing, gamma << 1,
our solution recovers a known formula for a short mesoscopic connector extended
to the MAR regime. At large dephasing, the subharmonic gap structure in the IVC
scales with 1/ gamma, which thus plays the role of an effective tunneling
parameter. In this limit, the even gap subharmonics are resonantly enhanced,
and the IVC exhibits portions with negative differential resistance. | | Source: | arXiv, 1103.4640 | | Services: | Forum | Review | PDF | Favorites | |
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