Defect-mediated phonon dynamics in TaS2 and WSe2

Structural Dynamics
Daniel R CremonsDavid J Flannigan

Abstract

We report correlative crystallographic and morphological studies of defect-dependent phonon dynamics in single flakes of 1T-TaS2 and 2H-WSe2 using selected-area diffraction and bright-field imaging in an ultrafast electron microscope. In both materials, we observe in-plane speed-of-sound acoustic-phonon wave trains, the dynamics of which (i.e., emergence, propagation, and interference) are strongly dependent upon discrete interfacial features (e.g., vacuum/crystal and crystal/crystal interfaces). In TaS2, we observe cross-propagating in-plane acoustic-phonon wave trains of differing frequencies that undergo coherent interference approximately 200 ps after initial emergence from distinct interfacial regions. With ultrafast bright-field imaging, the properties of the interfering wave trains are observed to correspond to the beat frequency of the individual oscillations, while intensity oscillations of Bragg spots generated from selected areas within the region of interest match well with the real-space dynamics. In WSe2, distinct acoustic-phonon dynamics are observed emanating and propagating away from structurally dissimilar morphological discontinuities (vacuum/crystal interface and crystal terrace), and results of ultrafast se...Continue Reading

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Citations

May 17, 2017·Nano Letters·Alyssa J McKennaDavid J Flannigan
Nov 30, 2018·Reports on Progress in Physics·Gary BeaneGregory V Hartland
Apr 29, 2020·Structural Dynamics·Daniel X Du, David J Flannigan
Oct 27, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Elisah J VandenBussche, David J Flannigan
Dec 23, 2020·Nanomaterials·Fabien Vialla, Natalia Del Fatti
Oct 24, 2018·Ultramicroscopy·Elisah J VandenBussche, David J Flannigan
Apr 29, 2021·Structural Dynamics·A NakamuraK Ishizaka
Jul 9, 2021·The Journal of Physical Chemistry Letters·Spencer A ReisbickDavid J Flannigan
Oct 15, 2021·Physical Chemistry Chemical Physics : PCCP·Wyatt A Curtis, David J Flannigan

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Methods Mentioned

BETA
electron diffraction
electron-scattering

Software Mentioned

COMSOL Multiphysics Structural Mechanics

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