Evidence for an excited non-equilibrium quasiparticle distribution in superconducting tunnel junctions resulting from energy accumulation via sequential tunnelling.

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https://doi.org/10.1103/PhysRevB.69.184506
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Keywords

excited states, quasiparticles, superconductive tunnelling, superconducting energy gap, Cooper pairs, phonons, aluminium, tantalum, superconducting junction devices

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Evidence for an excited non-equilibrium quasiparticle distribution in superconducting tunnel junctions resulting from energy accumulation via sequential tunnelling. / Kozorezov, Alexander G.; Wigmore, J. K.; Peacock, A. et al.
In: Physical review B, Vol. 69, 2004, p. 184506.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{e6a3b38edce24e089db067877f3dfdfe,

title = "Evidence for an excited non-equilibrium quasiparticle distribution in superconducting tunnel junctions resulting from energy accumulation via sequential tunnelling.",

abstract = "We have observed experimentally and modeled theoretically a previously unidentified nonequilibrium state in superconducting tunnel junctions. The state occurs in small gap, multiple tunneling junctions, and is caused by the raising in energy of the quasiparticle distribution through multiple cycles of sequential forward- and back-tunneling events. Because of the low-energy gap, quasiparticles may survive in the higher-energy states until they reach the energy threshold for emission of Cooper pair-breaking phonons, leading to generation of further quasiparticles. We modeled the process by solving the coupled system of kinetic equations for interacting quasiparticles and phonons, and studied the effect experimentally in high quality Al and Ta/Al superconducting tunnel junctions in the temperature range 40–300 mK. The distinctive features are large subgap currents exceeding that due to thermal excitations by several orders of magnitude at low temperatures, together with a very sharp onset of current with bias voltage",

keywords = "excited states, quasiparticles, superconductive tunnelling, superconducting energy gap, Cooper pairs, phonons, aluminium, tantalum, superconducting junction devices",

author = "Kozorezov, {Alexander G.} and Wigmore, {J. K.} and A. Peacock and {den Hartog}, R. and D. Martin and G. Brammertz and P. Verhoeve and N. Rando",

year = "2004",

doi = "10.1103/PhysRevB.69.184506",

language = "English",

volume = "69",

pages = "184506",

journal = "Physical review B",

issn = "1550-235X",

publisher = "AMER PHYSICAL SOC",

}

RIS

TY - JOUR

T1 - Evidence for an excited non-equilibrium quasiparticle distribution in superconducting tunnel junctions resulting from energy accumulation via sequential tunnelling.

AU - Kozorezov, Alexander G.

AU - Wigmore, J. K.

AU - Peacock, A.

AU - den Hartog, R.

AU - Martin, D.

AU - Brammertz, G.

AU - Verhoeve, P.

AU - Rando, N.

PY - 2004

Y1 - 2004

N2 - We have observed experimentally and modeled theoretically a previously unidentified nonequilibrium state in superconducting tunnel junctions. The state occurs in small gap, multiple tunneling junctions, and is caused by the raising in energy of the quasiparticle distribution through multiple cycles of sequential forward- and back-tunneling events. Because of the low-energy gap, quasiparticles may survive in the higher-energy states until they reach the energy threshold for emission of Cooper pair-breaking phonons, leading to generation of further quasiparticles. We modeled the process by solving the coupled system of kinetic equations for interacting quasiparticles and phonons, and studied the effect experimentally in high quality Al and Ta/Al superconducting tunnel junctions in the temperature range 40–300 mK. The distinctive features are large subgap currents exceeding that due to thermal excitations by several orders of magnitude at low temperatures, together with a very sharp onset of current with bias voltage

AB - We have observed experimentally and modeled theoretically a previously unidentified nonequilibrium state in superconducting tunnel junctions. The state occurs in small gap, multiple tunneling junctions, and is caused by the raising in energy of the quasiparticle distribution through multiple cycles of sequential forward- and back-tunneling events. Because of the low-energy gap, quasiparticles may survive in the higher-energy states until they reach the energy threshold for emission of Cooper pair-breaking phonons, leading to generation of further quasiparticles. We modeled the process by solving the coupled system of kinetic equations for interacting quasiparticles and phonons, and studied the effect experimentally in high quality Al and Ta/Al superconducting tunnel junctions in the temperature range 40–300 mK. The distinctive features are large subgap currents exceeding that due to thermal excitations by several orders of magnitude at low temperatures, together with a very sharp onset of current with bias voltage

KW - excited states

KW - quasiparticles

KW - superconductive tunnelling

KW - superconducting energy gap

KW - Cooper pairs

KW - phonons

KW - aluminium

KW - tantalum

KW - superconducting junction devices

U2 - 10.1103/PhysRevB.69.184506

DO - 10.1103/PhysRevB.69.184506

M3 - Journal article

VL - 69

SP - 184506

JO - Physical review B

JF - Physical review B

SN - 1550-235X

ER -

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