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Author |
Bulaevskii, L. N.; Graf, M. J.; Batista, C. D.; Kogan, V. G. |
Title |
Vortex-induced dissipation in narrow current-biased thin-film superconducting strips |
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Journal Article |
Year |
2011 |
Publication |
Phys. Rev. B |
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Phys. Rev. B |
Volume |
83 |
Issue |
14 |
Pages |
9 |
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Abstract |
A vortex crossing a thin-film superconducting strip from one edge to the other, perpendicular to the bias current, is the dominant mechanism of dissipation for films of thickness d on the order of the coherence length ξ and of width w much narrower than the Pearl length Λâ‰<ab>wâ‰<ab>ξ. At high bias currents I*<I<Ic the heat released by the crossing of a single vortex suffices to create a belt-like normal-state region across the strip, resulting in a detectable voltage pulse. Here Ic is the critical current at which the energy barrier vanishes for a single vortex crossing. The belt forms along the vortex path and causes a transition of the entire strip into the normal state. We estimate I* to be roughly Ic/3. Furthermore, we argue that such “hot†vortex crossings are the origin of dark counts in photon detectors, which operate in the regime of metastable superconductivity at currents between I* and Ic. We estimate the rate of vortex crossings and compare it with recent experimental data for dark counts. For currents below I*, that is, in the stable superconducting but resistive regime, we estimate the amplitude and duration of voltage pulses induced by a single vortex crossing. |
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RPLAB @ gujma @ |
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688 |
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Minaeva, Olga; Bonato, Cristian; Saleh, Bahaa E. A.; Simon, David S.; Sergienko, Alexander V. |
Title |
Odd- and even-order dispersion cancellation in quantum interferometry |
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Journal Article |
Year |
2009 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
Volume |
102 |
Issue |
10 |
Pages |
4 |
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We describe a novel effect involving odd-order dispersion cancellation. We demonstrate that odd- and even-order dispersion cancellation may be obtained in different regions of a single quantum interferogram using frequency-anticorrelated entangled photons and a new type of quantum interferometer. This offers new opportunities for quantum communication and metrology in dispersive media. |
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RPLAB @ gujma @ |
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699 |
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Author |
Usadel, Klaus D. |
Title |
Generalized diffusion equation for superconducting alloys |
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Journal Article |
Year |
1970 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
Volume |
25 |
Issue |
8 |
Pages |
507 |
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Eilenberger's transportlike equations for a superconductor of type II can be simplified very much in the dirty limit. In this limit a diffusionlike equation is derived which is the generalization of the de Gennes-Maki theory for dirty superconductors to arbitrary values of the order parameter. |
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Boogaard, G.R.; Verbruggen, A.H.; Belzig, W.; Klapwijk T.M. |
Title |
Resistance of superconducting nanowires connected to normal-metal leads |
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Journal Article |
Year |
2004 |
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Phys. Rev. B |
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Phys. Rev. B |
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69 |
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220503(R)(1-4) |
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We study experimentally the low temperature resistance of superconducting nanowires connected to normal metal reservoirs. Wefind that a substantial fraction of the nanowires is resistive, down to the lowest tempera-ture measured, indicative of an intrinsic boundary resistance due to the Andreev-conversion of normal current to supercurrent. The results are successfully analyzed in terms of the kinetic equations for diffusive superconductors. |
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RPLAB @ atomics90 @ |
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960 |
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Matthias, B. T. |
Title |
Transition temperatures of superconductors |
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Journal Article |
Year |
1953 |
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Phys. Rev. |
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Phys. Rev. |
Volume |
92 |
Issue |
4 |
Pages |
874-876 |
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Superconductivity has been found in a number of new compounds between the non-superconducting transition elements and nonmetals such as Si, Ge, and Te. These findings have suggested possible criteria for superconductivity in both elements and compounds. |
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RPLAB @ phisix @ |
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987 |
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