Shift-current-induced strain waves in LiNbO3 mapped by femtosecond x-ray diffraction

被引：15

作者：

Holtz, Marcel ^{[1
]}

Hauf, Christoph ^{[1
]}

Salvador, Antonio-Andres Hernandez ^{[1
]}

Costard, Rene ^{[1
]}

Woerner, Michael ^{[1
]}

Elsaesser, Thomas ^{[1
]}

机构：

[1] Max Born Inst Nichtlineare Opt & Kurzzeitspektros, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 10期

关键词：

LITHIUM-NIOBATE; LATTICE-DYNAMICS; PHONONS; SUPERLATTICES; EXCITATION; OPTICS; TENSOR;

D O I：

10.1103/PhysRevB.94.104302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The response of the crystal lattice to an electric shift current induced via the two-photon bulk-photovoltaic effect in a lithium niobate (LiNbO3) crystal is directly mapped by femtosecond x-ray diffraction. Acoustic strain waves of large amplitude are generated by piezoelectric coupling to the current-related polarization while other mechanisms such as anharmonic phonon-phonon couplings and electron-phonon coupling through deformation potentials play a minor role. A striking variation of the strain wave speed occurs as a function of the relative orientation between the crystal's c-axis, the direction of the current flow, and the polarization of the incident pump pulse. The observed behavior is relevant for a large class of ferroelectrics.

引用

页数：7

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