Theory of ultrafast nonequilibrium dynamics in d-wave superconductors

被引：31

作者：

Unterhinninghofen, J. ^{[1
]}

Manske, D. ^{[1
]}

Knorr, A. ^{[2
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[2] Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.77.180509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use density-matrix theory to calculate the ultrafast dynamics of unconventional superconductors from a microscopic viewpoint. We calculate the time evolution of the optical conductivity as well as pump-probe spectra for a d-wave order parameter. Three regimes can be distinguished in the spectra. The Drude response at low photon energies is the only one of those which has been experimentally measured so far. At higher energies, we predict two more regimes: the pair-breaking peak, which is reduced as Cooper pairs are broken up by the exciting pulse, and a suppression above the pair-breaking peak due to nonequilibrium quasiparticles. Furthermore, we consider the influence of the electron-phonon coupling and derive rate equations that have been widely used so far.

引用

页数：4

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