Ultrafast electron relaxation in superconducting Bi2Sr2CaCu2O8+δ by time-resolved photoelectron spectroscopy

被引：262

作者：

Perfetti, L.

Loukakos, P. A.

Lisowski, M.

Bovensiepen, U.

Eisaki, H.

Wolf, M.

机构：

[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany

[2] AIST, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.99.197001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Time-resolved photoelectron spectroscopy is employed to study the dynamics of photoexcited electrons in optimally doped Bi2Sr2CaCu2O8+delta (Bi-2212). Hot electrons thermalize in less than 50 fs and dissipate their energy on two distinct time scales (110 fs and 2 ps). These are attributed to the generation and subsequent decay of nonequilibrium phonons, respectively. We conclude that 20% of the total lattice modes dominate the coupling strength and estimate the second momentum of the Eliashberg coupling function lambda Omega(2)(0)=360 +/- 30 meV(2). For the typical phonon energy of copper-oxygen bonds (Omega(0)similar or equal to 40-70 meV), this results in an average electron-phonon coupling lambda < 0.25.

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页数：4

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