Direct observation of non-fully-symmetric coherent optical phonons by femtosecond x-ray diffraction

被引：21

作者：

Johnson, S. L. ^{[1
]}

Beaud, P. ^{[2
]}

Moehr-Vorobeva, E. ^{[2
]}

Caviezel, A. ^{[2
]}

Ingold, G. ^{[2
]}

Milne, C. J. ^{[3
]}

机构：

[1] Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland

[2] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[3] Ecole Polytech Fed Lausanne, Lab Spect Ultrarapide, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

SEMIMETALS; EXCITATION; ANTIMONY; BISMUTH;

D O I：

10.1103/PhysRevB.87.054301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We directly measure by femtosecond time-resolved x-ray diffraction the E-g symmetry coherent phonon excited in bismuth by a strong optical pulse. The magnitude of the E-g mode observed is 0.2 pm peak-to-peak, compared against the 2.7-pm initial displacement of the fully symmetric A(1g) mode. The much smaller motion of the E-g mode is a consequence of the short lifetime of the electronic states that drive the atomic motion. The experimentally measured magnitude of the E-g motion allows us to rule out a previously suggested scenario for explaining the dynamics in bismuth that relies on strong coupling between these modes. DOI: 10.1103/PhysRevB.87.054301

引用

页数：8

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