Direct observation of electron thermalization and electron-phonon coupling in photoexcited bismuth

被引：52

作者：

Faure, J. ^{[1
]}

Mauchain, J. ^{[2
]}

Papalazarou, E. ^{[2
]}

Marsi, M. ^{[2
]}

Boschetto, D. ^{[1
]}

Timrov, I. ^{[3
]}

Vast, N. ^{[3
]}

Ohtsubo, Y. ^{[4
]}

Arnaud, B. ^{[5
]}

Perfetti, L. ^{[3
]}

机构：

[1] Ecole Polytech, CNRS, Lab Opt Appl, ENSTA,UMR 7639, F-91761 Palaiseau, France

[2] Univ Paris 11, CNRS, Lab Phys Solides, UMR 8502, F-91405 Orsay, France

[3] Ecole Polytech, CNRS, Lab Solides Irradies, CEA DSM,UMR 7642, F-91128 Palaiseau, France

[4] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[5] Inst Phys Rennes, UMR UR1, CNRS 6251, F-35042 Rennes, France

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 07期

基金：

欧洲研究理事会;

关键词：

RELAXATION;

D O I：

10.1103/PhysRevB.88.075120

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the ultrafast response of the bismuth (111) surface by means of time-resolved photoemission spectroscopy. The direct visualization of the electronic structure allows us to gain insights on electron-electron and electron-phonon interaction. Concerning electron-electron interaction, it is found that electron thermalization is fluence dependent and can take as much as several hundreds of femtoseconds at low fluences. This behavior is in qualitative agreement with Landau's theory of Fermi liquids, but the data show deviations from the behavior of a common three-dimensional degenerate electron gas. Concerning electron-phonon interaction, our data allows us to directly observe the coupling of Bloch states to the coherent A(1g) mode. It is found that surface states are much less coupled to this mode when compared to bulk states. This is confirmed by ab initio calculations of surface and bulk bismuth.

引用

页数：8

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