Records |
Author |
Su, M. Y.; Carter, S. G.; Sherwin, M. S. |
Title |
Strong-field terahertz optical mixing in excitons |
Type |
Journal Article |
Year |
2003 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
Volume |
67 |
Issue |
12 |
Pages |
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Keywords |
optical mixing |
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ISSN |
1098-0121 |
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Serial |
500 |
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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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Serial |
924 |
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Author |
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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no |
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1519 |
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Author |
Ciulin, V.; Carter, S. G.; Sherwin, M. S. |
Title |
Terahertz optical mixing in biased GaAs single quantum wells |
Type |
Journal Article |
Year |
2004 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
Volume |
70 |
Issue |
11 |
Pages |
115312-(1-6) |
Keywords |
optical mixing |
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1098-0121 |
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no |
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Serial |
501 |
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Author |
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) |
Keywords |
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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 @ |
Serial |
960 |
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