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Beck, M.; Rousseau, I.; Klammer, M.; Leiderer, P.; Mittendorff, M.; Winnerl, S.; Helm, M.; Gol'tsman, G.N.; Demsar, J. |
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Transient increase of the energy gap of superconducting NbN thin films excited by resonant narrow-band terahertz pulses |
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Journal Article |
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2013 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
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110 |
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26 |
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267003 (1 to 5) |
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NbN thin films, energy gap |
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Abstract |
Observations of radiation-enhanced superconductivity have thus far been limited to a few type-I superconductors (Al, Sn) excited at frequencies between the inelastic scattering rate and the superconducting gap frequency 2Delta/h. Utilizing intense, narrow-band, picosecond, terahertz pulses, tuned to just below and above 2Delta/h of a BCS superconductor NbN, we demonstrate that the superconducting gap can be transiently increased also in a type-II dirty-limit superconductor. The effect is particularly pronounced at higher temperatures and is attributed to radiation induced nonthermal electron distribution persisting on a 100 ps time scale. |
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Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457, Germany |
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PMID:23848912 |
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1370 |
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Bremer, J. W.; Newhouse, V. L. |
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1958 |
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Phys. Rev. Lett. |
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1 |
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282 |
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Bremer, J. W.; Newhouse, V. L. |
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MSPU @ s @ bremer_prl_1958 |
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215 |
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Callen, Herbert. B.; Welton, Theodore A. |
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Irreversibility and generalized noise |
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1951 |
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Phys. Rev. |
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83 |
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1 |
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34-40 |
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American Physical Society |
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214 |
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Rothwarf, Allen; Taylor, B. N. |
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Measurement of recombination lifetimes in superconductors |
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1967 |
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Phys. Rev. Lett. |
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19 |
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1 |
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27-30 |
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MSPU @ s @ |
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220 |
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Parker, W. H. |
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Title |
Modified heating theory of nonequilibrium superconductors |
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1975 |
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Phys. Rev. B |
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12 |
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9 |
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3667-3672 |
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American Physical Society |
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mht_Parker_1975 |
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221 |
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