%0 Journal Article
%T Transient increase of the energy gap of superconducting NbN thin films excited by resonant narrow-band terahertz pulses
%A Beck, M.
%A Rousseau, I.
%A Klammer, M.
%A Leiderer, P.
%A Mittendorff, M.
%A Winnerl, S.
%A Helm, M.
%A Gol'tsman, G. N.
%A Demsar, J.
%J Phys. Rev. Lett.
%D 2013
%V 110
%N 26
%@ 0031-9007
%F Beck_etal2013
%O PMID:23848912
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1370), last updated on Thu, 13 May 2021 14:45:43 -0500
%X 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.
%K NbN thin films
%K energy gap
%R 10.1103/PhysRevLett.110.267003
%U http://www.ncbi.nlm.nih.gov/pubmed/23848912
%U https://doi.org/10.1103/PhysRevLett.110.267003
%P 267003 (1 to 5)