10.1021/acs.nanolett.5b02805.s001
Ehren
M. Mannebach
Ehren
M.
Mannebach
Renkai Li
Renkai
Li
Karel-Alexander Duerloo
Karel-Alexander
Duerloo
Clara Nyby
Clara
Nyby
Peter Zalden
Peter
Zalden
Theodore Vecchione
Theodore
Vecchione
Friederike Ernst
Friederike
Ernst
Alexander Hume Reid
Alexander Hume
Reid
Tyler Chase
Tyler
Chase
Xiaozhe Shen
Xiaozhe
Shen
Stephen Weathersby
Stephen
Weathersby
Carsten Hast
Carsten
Hast
Robert Hettel
Robert
Hettel
Ryan Coffee
Ryan
Coffee
Nick Hartmann
Nick
Hartmann
Alan
R. Fry
Alan
R.
Fry
Yifei Yu
Yifei
Yu
Linyou Cao
Linyou
Cao
Tony F. Heinz
Tony F.
Heinz
Evan J. Reed
Evan J.
Reed
Hermann A. Dürr
Hermann A.
Dürr
Xijie Wang
Xijie
Wang
Aaron M. Lindenberg
Aaron M.
Lindenberg
Dynamic Structural Response and Deformations of Monolayer
MoS<sub>2</sub> Visualized by Femtosecond Electron Diffraction
American Chemical Society
2015
femtosecond electron
Dynamic Structural Response
percent peak strains
material
heat flow
ultrafast strain engineering
Direct measurements
monolayer transition metal dichalcogenide MoS 2
Monolayer MoS 2 Visualized
2015-10-14 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Dynamic_Structural_Response_and_Deformations_of_Monolayer_MoS_sub_2_sub_Visualized_by_Femtosecond_Electron_Diffraction/2122420
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 MoS<sub>2</sub> 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.