Probing and controlling terahertz-driven structural dynamics with surface sensitivity

被引：21

作者：

Bowlan, P. ^{[1
]}

Bowlan, J. ^{[1
]}

Trugman, S. A. ^{[1
]}

Aguilar, R. Valdes ^{[2
]}

Qi, J. ^{[3
]}

Liu, X. ^{[4
]}

Furdyna, J. ^{[4
]}

Dobrowolska, M. ^{[1
]}

Taylor, A. J. ^{[1
]}

Yarotski, D. A. ^{[1
]}

Prasankumar, R. P. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, MS K771, Los Alamos, NM 87545 USA

[2] Ohio State Univ, Ctr Emergent Mat, Dept Phys, Columbus, OH 43210 USA

[3] Peac Inst Multiscale Sci, Chengdu 610207, Peoples R China

[4] Univ Notre Dame, Dept Phys, Indiana, PA 46556 USA

来源：

OPTICA | 2017年 / 4卷 / 03期

基金：

美国国家科学基金会;

关键词：

TOPOLOGICAL INSULATORS; GENERATION; BI2SE3; LIGHT; BI2TE3; SB2TE3; PULSES; FILMS; MODE;

D O I：

10.1364/OPTICA.4.000383

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Intense, single-cycle terahertz (THz)pulsesare powerful tools to understand and control material properties through low-energy resonances, such as phonons. Combining this with optical second harmonic generation (SHG) makes it possible to observe the resulting ultrafast structural changes with surface sensitivity. This makes SHG an ideal method to probe phonon dynamics in topological insulators (TI), materials with unique surface transport properties. Here, we resonantly excite a phonon mode in the TI Bi2Se3 with THz pulses and use SHG to separate the resulting symmetry changes at the surface from the bulk. Furthermore, we coherently control the lattice vibrations with a pair of THz pulses. Our work demonstrates a versatile, table-top tool to probe and control phonon dynamics in a range of systems, particularly at surfaces and interfaces. (C) 2017 Optical Society of America

引用

页码：383 / 387

页数：5

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