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| Author |
Tinkham, M.; Free, J. U.; Lau, C. N.; Markovic, N. |
| Title |
Hysteretic I–V curves of superconducting nanowires |
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Journal Article |
Year  |
2003 |
Publication |
Phys. Rev. B |
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| Volume |
68 |
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Pages |
134515(1 to 7) |
| Keywords |
MoGe nanowires, self-heating effect |
| Abstract |
Experimental I–V curves of superconducting MoGe nanowires show hysteresis for the thicker wires and none for the thinner wires. A rather quantitative account of these data for representative wires is obtained by numerically solving the one-dimensional heat flow equation to find a self-consistent distribution of temperature and local resistivity along the wire, using the measured linear resistance R(T) as input. This suggests that the retrapping current in the hysteretic I–V curves is primarily determined by heating effects, and not by the dynamics of phase motion in a tilted washboard potential as often assumed. Heating effects and thermal fluctuations from the low-resistance state to a high-resistance, quasinormal regime appear to set independent upper bounds for the switching current. |
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918 |
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| Author |
Anthore, A.; Pothier, H.; Esteve, D. |
| Title |
Density of states in a superconductor carrying a supercurrent |
Type |
Journal Article |
| Year |
2003 |
Publication |
Phys. Rev. Lett. |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
90 |
Issue |
12 |
Pages |
127001 (1 to 4) |
| Keywords |
Usadel, superconducting nanowire |
| Abstract |
We have measured the tunneling density of states (DOS) in a superconductor carrying a supercurrent or exposed to an external magnetic field. The pair correlations are weakened by the supercurrent, leading to a modification of the DOS and to a reduction of the gap. As predicted by the theory of superconductivity in diffusive metals, we find that this effect is similar to that of an external magnetic field. |
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Recommended by Klapwijk |
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no |
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924 |
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Zhang, J.; Słysz, W.; Pearlman, A.; Verevkin, A.; Sobolewski, R.; Okunev, O.; Chulkova, G.; Gol’tsman, G. N. |
| Title |
Time delay of resistive-state formation in superconducting stripes excited by single optical photons |
Type |
Journal Article |
| Year |
2003 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
67 |
Issue |
13 |
Pages |
132508 (1 to 4) |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We have observed a 65(±5)-ps time delay in the onset of a resistive-state formation in 10-nm-thick, 130-nm-wide NbN superconducting stripes exposed to single photons. The delay in the photoresponse decreased to zero when the stripe was irradiated by multi-photon (classical) optical pulses. Our NbN structures were kept at 4.2 K, well below the material’s critical temperature, and were illuminated by 100-fs-wide optical pulses. The time-delay phenomenon has been explained within the framework of a model based on photon-induced generation of a hotspot in the superconducting stripe and subsequent, supercurrent-assisted, resistive-state formation across the entire stripe cross section. The measured time delays in both the single-photon and two-photon detection regimes agree well with theoretical predictions of the resistive-state dynamics in one-dimensional superconducting stripes. |
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0163-1829 |
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1519 |
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Ciulin, V.; Carter, S. G.; Sherwin, M. S. |
| Title |
Terahertz optical mixing in biased GaAs single quantum wells |
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Journal Article |
| Year |
2004 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
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70 |
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11 |
Pages |
115312-(1-6) |
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optical mixing |
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1098-0121 |
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no |
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501 |
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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 |
Type |
Journal Article |
| Year |
2004 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
69 |
Issue |
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Pages |
220503(R)(1-4) |
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| Abstract |
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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