Dynamic Structural Response and Deformations of Monolayer MoS2 Visualized by Femtosecond Electron Diffraction

Nano Letters
Ehren M MannebachA M Lindenberg

Abstract

Two-dimensional materials are subject to intrinsic and dynamic rippling that modulates their optoelectronic and electromechanical properties. Here, we directly visualize the dynamics of these processes within monolayer transition metal dichalcogenide MoS2 using femtosecond electron scattering techniques as a real-time probe with atomic-scale resolution. We show that optical excitation induces large-amplitude in-plane displacements and ultrafast wrinkling of the monolayer on nanometer length-scales, developing on picosecond time-scales. These deformations are associated with several percent peak strains that are fully reversible over tens of millions of cycles. Direct measurements of electron-phonon coupling times and the subsequent interfacial thermal heat flow between the monolayer and substrate are also obtained. These measurements, coupled with first-principles modeling, provide a new understanding of the dynamic structural processes that underlie the functionality of two-dimensional materials and open up new opportunities for ultrafast strain engineering using all-optical methods.

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Citations

Jun 2, 2016·The Journal of Physical Chemistry Letters·Te HuAaron M Lindenberg
Dec 16, 2016·ACS Applied Materials & Interfaces·Aniruddha AdhikariOmar F Mohammed
May 17, 2017·Nano Letters·Alyssa J McKennaDavid J Flannigan
Nov 25, 2017·Nature Communications·Ming-Fu LinUwe Bergmann
Jun 30, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hiroyuki KumazoePriya Vashishta
Apr 5, 2017·The Review of Scientific Instruments·T VecchioneD Zhang
Sep 13, 2019·Optics Express·Mohamed A K OthmanEmilio A Nanni
May 22, 2019·Annual Review of Physical Chemistry·Benjamin T DirollRichard D Schaller
Feb 12, 2021·The Journal of Physical Chemistry Letters·Fabio Caruso
Dec 23, 2020·Nanomaterials·Fabien Vialla, Natalia Del Fatti
Jun 11, 2020·Ultramicroscopy·Pratiti DebDavid A Muller
Apr 17, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Pinqiang Cao, Jianyang Wu
Oct 24, 2018·Ultramicroscopy·Elisah J VandenBussche, David J Flannigan
Jun 8, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Roman MankowskyHenrik Till Lemke
Nov 10, 2017·Nano Letters·Ehren M MannebachAaron M Lindenberg
Aug 17, 2019·The Journal of Physical Chemistry. a·Xiao-Ying XieGanglong Cui
Nov 22, 2018·The Journal of Physical Chemistry. a·Xiang-Yang LiuGanglong Cui
Sep 7, 2017··Hermann A. DürrAlexander F. Schaeffer

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