Anisotropic Nonequilibrium Lattice Dynamics of Black Phosphorus

被引：35

作者：

Zahn, Daniela ^{[1
]}

Hildebrandt, Patrick-Nigel ^{[1
]}

Vasileiadis, Thomas ^{[1
]}

Windsor, Yoav William ^{[1
]}

Qi, Yingpeng ^{[1
]}

Seiler, Helene ^{[1
]}

Ernstorfer, Ralph ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

NANO LETTERS | 2020年 / 20卷 / 05期

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

black phosphorus; lattice dynamics; anisotropy; femtosecond electron diffraction; electron-phonon coupling; phonon-phonon coupling; CARRIER;

D O I：

10.1021/acs.nanolett.0c00734

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Black phosphorus has recently attracted significant attention for its highly anisotropic properties. A variety of ultrafast optical spectroscopies has been applied to probe the carrier response to photoexcitation, but the complementary lattice response has remained unaddressed. Here we employ femtosecond electron diffraction to explore how the structural anisotropy impacts the lattice dynamics after photoexcitation. We observe two time scales in the lattice response, which we attribute to electron-phonon and phonon-phonon thermalization. Pronounced differences between armchair and zigzag directions are observed, indicating a nonthermal state of the lattice lasting up to similar to 60 ps. This nonthermal state is characterized by a modified anisotropy of the atomic vibrations compared to equilibrium. Our findings provide insights in both electron-phonon as well as phonon-phonon coupling and bear direct relevance for any application of black phosphorus in nonequilibrium conditions.

引用

页码：3728 / 3733

页数：6

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