Ultrafast formation of quantized interlayer vibrations in Bi 2 Se 3 by photoinduced strain waves

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...

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Bibliographic Details
Published in:	Optics express Vol. 30; no. 20; p. 35988
Main Authors:	Park, Tae Gwan, Oh, Eon-Taek, Kim, Sungwon, Ou, Yunbo, Moodera, Jagadeesh, Kim, Hyunjung, Rotermund, Fabian
Format:	Journal Article
Language:	English
Published:	26-09-2022
Online Access:	Get full text
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Summary:	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.
ISSN:	1094-4087 1094-4087
DOI:	10.1364/OE.470310