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
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页数：8
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