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

被引：111

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.

引用

页数：4

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