Open AccessUltrafast formation of quantized interlayer vibrations in Bi2Se3 by photoinduced strain waves
Author(s) -
TAE GWAN PARK,
Eon-Taek Oh,
Sung-Won Kim,
Yunbo Ou,
Jagadeesh S. Moodera,
Hyun-Jung Kim,
Fabıan Rotermund
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.470310
Subject(s) - ultrashort pulse , materials science , spectroscopy , optics , vibration , wavelength , coherent spectroscopy , infrared , molecular vibration , sum frequency generation , optoelectronics , nonlinear optics , molecular physics , laser , physics , raman spectroscopy , raman scattering , coherent anti stokes raman spectroscopy , quantum mechanics
This study comprehensively investigated the coherent lattice dynamics in Bi 2 Se 3 by ultrafast optical pump-probe spectroscopy with tunable near-infrared probe pulses. Sample-thickness- and probe-wavelength-dependent experiments revealed the key role of Bi 2 Se 3 optical property in the generation and detection of photoinduced strain waves, whose confinement initiated coherent interlayer vibrations. Furthermore, the frequency and lifetime of the interlayer vibrations could be quantitatively explained with a modified linear chain and an acoustic mismatch model considering elastic coupling at sample-substrate interfaces. The results of this work provide insights for analyzing and interpreting, through ultrafast optical spectroscopy, nanomechanical interactions in layered materials.