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Title: Probing and controlling terahertz-driven structural dynamics with surface sensitivity

Intense, single-cycle terahertz (THz) pulses are 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 Bi 2Se 3with 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. Lastly, our work demonstrates a versatile, table-top tool to probe and control phonon dynamics in a range of systems, particularly at surfaces and interfaces.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. The Ohio State Univ., Columbus, OH (United States). Center for Emergent Materials, Dept. of Physics
  3. Peac Inst. of Multiscale Sciences, Chengdu (China)
  4. Univ. of Notre Dame, IN (United States). Dept. of Physics
Publication Date:
Report Number(s):
LA-UR-16-27580
Journal ID: ISSN 2334-2536
Grant/Contract Number:
AC52-06NA25396; DMR14-00432
Type:
Accepted Manuscript
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science
OSTI Identifier:
1351229