Record Details

Title:
Dynamic Structural Response and Deformations of Monolayer $MoS_{2}$ Visualized by Femtosecond Electron Diffraction
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument FXE
Topic:
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 $MoS_{2}$ 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.
Imprint:
Washington, DC, ACS Publ., 2015
Journal Information:
Nano Lett., 15, 10, 6889-6895 (2015)
ISSN:
1530-6984
1530-6992
Related external records:
DOI: 10.1021/acs.nanolett.5b02805
WOS: WOS:000363003100091
Language(s):
English
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