Opto-Mechanics Driven Fast Martensitic Transition in Two-Dimensional Materials
Name
Zhou et al. - 2018 - Opto-Mechanics Driven Fast Martensitic Transition.pdf
Description
Accepted version
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819.21 KB
Format
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Checksum (MD5)
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Author(s)
Zhou, Jian
Xu, Haowei
Li, Yifei
Jaramillo, Rafael
Li, Ju
Date Issued
November 2018
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Zhou, Jian et al. "Opto-Mechanics Driven Fast Martensitic Transition in Two-Dimensional Materials." Nano Letters 18, 12 (November 2018): 7794–7800 © 2018 American Chemical Society
Version
Author's final manuscript
Abstract
Diffusional phase-change materials, such as Ge-Sb-Te alloys, are used in rewritable nonvolatile memory devices. But the continuous pursuit of readout/write speed and reduced energy consumption in miniaturized devices calls for an optically driven, diffusionless phase change scheme in ultrathin materials. Inspired by optical tweezers, in this work, we illustrate theoretically and computationally that a linearly polarized laser pulse with selected frequency can drive an ultrafast diffusionless martensitic phase transition of two-dimensional ferroelastic materials such as SnO and SnSe monolayers, where the unit-cell strain is tweezed as a generalized coordinate that affects the anisotropic dielectric function and electromagnetic energy density. At laser power of 2.0 × 10[superscript 10]and 7.7 × 10 [superscript 9] W/cm[superscript 2], the transition potential energy barrier vanishes between two 90°-orientation variants of ferroelastic SnO and SnSe monolayer, respectively, so displacive domain switching can occur within picoseconds. The estimated adiabatic thermal limit of energy input in such optomechanical martensitic transition (OMT) is at least 2 orders of magnitude lower than that in Ge-Sb-Te alloy.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1021/acs.nanolett.8b03559
