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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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2013

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Rousseau, Ian
Klammer, Maximilian
Mittendorff, Martin
Winnerl, Stephan
Helm, Manfred
Goltsman, Gregory N.

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https://doi.org/10.1103/PhysRevLett.110.267003
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Physical Review Letters. 2013, 110(26), 267003. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.110.267003

Zusammenfassung

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 2Δ/h. Utilizing intense, narrow-band, picosecond, terahertz pulses, tuned to just below and above 2Δ/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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ISO 690BECK, Matthias, Ian ROUSSEAU, Maximilian KLAMMER, Paul LEIDERER, Martin MITTENDORFF, Stephan WINNERL, Manfred HELM, Gregory N. GOLTSMAN, Jure DEMSAR, 2013. Transient Increase of the Energy Gap of Superconducting NbN Thin Films Excited by Resonant Narrow-Band Terahertz Pulses. In: Physical Review Letters. 2013, 110(26), 267003. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.110.267003
BibTex
@article{Beck2013-06-28Trans-41911,
  year={2013},
  doi={10.1103/PhysRevLett.110.267003},
  title={Transient Increase of the Energy Gap of Superconducting NbN Thin Films Excited by Resonant Narrow-Band Terahertz Pulses},
  number={26},
  volume={110},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Beck, Matthias and Rousseau, Ian and Klammer, Maximilian and Leiderer, Paul and Mittendorff, Martin and Winnerl, Stephan and Helm, Manfred and Goltsman, Gregory N. and Demsar, Jure},
  note={Article Number: 267003}
}
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