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Ultrafast Optomechanical Strain in Layered GeS. | LitMetric

AI Article Synopsis

  • The study explores strong coupling between light and mechanical strain in two-dimensional materials, specifically focusing on germanium sulfide (GeS), which could lead to advanced optical micro- and nano-electromechanical systems.
  • Using ultrafast electron diffraction, researchers observed rapid in-plane strain changes of about 0.1% in GeS, with a quick response time of 10 picoseconds and varying strains in different crystallographic directions.
  • The findings suggest that this structural deformation is influenced by electronic density changes and electric fields, rather than just heating, paving the way for innovative approaches in optomechanical control and strain engineering in technology.

Article Abstract

Strong coupling between light and mechanical strain forms the foundation for next-generation optical micro- and nano-electromechanical systems. Such optomechanical responses in two-dimensional materials present novel types of functionalities arising from the weak van der Waals bond between atomic layers. Here, by using structure-sensitive megaelectronvolt ultrafast electron diffraction, we report the experimental observation of optically driven ultrafast in-plane strain in the layered group IV monochalcogenide germanium sulfide (GeS). Surprisingly, the photoinduced structural deformation exhibits strain amplitudes of order 0.1% with a 10 ps fast response time and a significant in-plane anisotropy between zigzag and armchair crystallographic directions. Rather than arising due to heating, experimental and theoretical investigations suggest deformation potentials caused by electronic density redistribution and converse piezoelectric effects generated by photoinduced electric fields are the dominant contributors to the observed dynamic anisotropic strains. Our observations define new avenues for ultrafast optomechanical control and strain engineering within functional devices.

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Source
http://dx.doi.org/10.1021/acs.nanolett.2c05048DOI Listing

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