Proximity effect and multiple Andreev reflections in chaotic Josephson junctions

P. Samuelsson; G. Johansson; Ingerman; V. S. Shumeiko; G. Wendin

doi:10.1103/PhysRevB.65.180514

Proximity effect and multiple Andreev reflections in chaotic Josephson junctions

P. Samuelsson, G. Johansson, Ingerman, V. S. Shumeiko, G. Wendin

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Abstract

We study the dc-current transport in a voltage biased superconductor-chaotic-dot-superconductor junction with an induced proximity effect in the dot. It is found that for a Thouless energy (formula presented) of the dot smaller than the superconducting energy gap (formula presented) the proximity effect is manifested as peaks in the differential conductance at voltages of order (formula presented) away from the even subharmonic gap structures (formula presented) These peaks are insensitive to temperatures (formula presented) but are suppressed by a weak magnetic field. This provides a qualitative explanation for recent experimental observations by Kutchinsky et al. [Phys. Rev. B 56, R2932 (1997)].

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.65.180514
State	Published - 2002
Externally published	Yes

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title = "Proximity effect and multiple Andreev reflections in chaotic Josephson junctions",

abstract = "We study the dc-current transport in a voltage biased superconductor-chaotic-dot-superconductor junction with an induced proximity effect in the dot. It is found that for a Thouless energy (formula presented) of the dot smaller than the superconducting energy gap (formula presented) the proximity effect is manifested as peaks in the differential conductance at voltages of order (formula presented) away from the even subharmonic gap structures (formula presented) These peaks are insensitive to temperatures (formula presented) but are suppressed by a weak magnetic field. This provides a qualitative explanation for recent experimental observations by Kutchinsky et al. [Phys. Rev. B 56, R2932 (1997)].",

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AU - Johansson, G.

AU - Ingerman,

AU - Shumeiko, V. S.

AU - Wendin, G.

PY - 2002

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AB - We study the dc-current transport in a voltage biased superconductor-chaotic-dot-superconductor junction with an induced proximity effect in the dot. It is found that for a Thouless energy (formula presented) of the dot smaller than the superconducting energy gap (formula presented) the proximity effect is manifested as peaks in the differential conductance at voltages of order (formula presented) away from the even subharmonic gap structures (formula presented) These peaks are insensitive to temperatures (formula presented) but are suppressed by a weak magnetic field. This provides a qualitative explanation for recent experimental observations by Kutchinsky et al. [Phys. Rev. B 56, R2932 (1997)].

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Proximity effect and multiple Andreev reflections in chaotic Josephson junctions

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