Spatiotemporal Evolution of Coherent Elastic Strain Waves in a Single MoS2 Flake

Nano Letters
Alyssa J McKennaDavid J Flannigan

Abstract

We use bright-field imaging in an ultrafast electron microscope to spatiotemporally map the evolution of photoexcited coherent strain waves in a single, micrometer-size flake of MoS2. Following in situ femtosecond photoexcitation, we observe individual wave trains emerge from discrete nanoscale morphological features and propagate in-plane along specific wave vectors at approximately the speed of sound (7 nm/ps). Over the span of several hundred picoseconds, the 50 GHz wave trains (20 ps periods) are observed to undergo phonon-phonon scattering and wave-train interference, resulting in a transition to larger-scale, incoherent structural dynamics. This incoherent motion further evolves into coherent nanomechanical oscillations over a few nanoseconds, ultimately leading to megahertz, whole-flake multimode resonances having microsecond lifetimes. These results provide insight into the low-frequency structural response of MoS2 to relatively coherent optical photoexcitation by elucidating the origin and the evolution of high-velocity, gigahertz strain waves.

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Citations

Feb 29, 2020·Advanced Materials·Qiaoli ChenYihan Zhu
Nov 30, 2018·Reports on Progress in Physics·Gary BeaneGregory V Hartland
Apr 29, 2020·Structural Dynamics·Daniel X Du, David J Flannigan
Oct 17, 2020·Structural Dynamics·Pavel K OlshinUlrich J Lorenz
Oct 27, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Elisah J VandenBussche, David J Flannigan
Oct 24, 2018·Ultramicroscopy·Elisah J VandenBussche, David J Flannigan
Jul 9, 2021·The Journal of Physical Chemistry Letters·Spencer A ReisbickDavid J Flannigan
Jan 25, 2019·Nano Letters·Bin ChenChennupati Jagadish
Aug 23, 2019·Nano Letters·Elisah J VandenBussche, David J Flannigan
Oct 15, 2021·Physical Chemistry Chemical Physics : PCCP·Wyatt A Curtis, David J Flannigan
Nov 16, 2021·ACS Nano·Yichao ZhangDavid J Flannigan

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