Energy-Gap Dynamics of Superconducting NbN Thin Films Studied by Time-Resolved Terahertz Spectroscopy

被引：108
|
作者：
Beck, M. [1 ,2 ]
Klammer, M. [1 ,2 ]
Lang, S. [1 ,2 ]
Leiderer, P. [1 ,2 ]
Kabanov, V. V.
Gol'tsman, G. N. [3 ]
Demsar, J. [1 ,2 ]
机构：
[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany
[2] Univ Konstanz, Ctr Appl Photon, D-78457 Constance, Germany
[3] Moscow State Pedag Univ, Moscow 119435, Russia
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 17期
关键词：
YBA2CU3O7-DELTA; RELAXATION; RADIATION; DETECTORS; TC;
D O I：
10.1103/PhysRevLett.107.177007
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, gimel = 1.1 +/- 0.1, which is in excellent agreement with theoretical estimates.
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页数：4
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