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Title: Strong enhancement of surface diffusion by nonlinear surface acoustic waves

Abstract

The phenomenon of acoustic activation of surface diffusion is investigated in a combined computational and experimental study. The ability of pulsed laser-generated surface acoustic waves (SAWs) to enhance the mobility of small atomic clusters is demonstrated by directly tracking, with fluorescence microscopy, individual Au 8 clusters moving on a (111) silicon substrate. A 19-fold increase in the effective diffusion coefficient is measured in room temperature experiments in the presence of SAWs generated by nanosecond pulse laser irradiation at a 100 Hz repetition rate. A strong enhancement of cluster mobility by SAWs is also observed in large-scale molecular dynamics simulations of surface diffusion of small atomic clusters. The analysis of the computational results demonstrates that the nonlinear sharpening of SAWs and the corresponding enrichment of the SAW spectra by high frequency harmonics which are capable of dynamic coupling to the cluster vibrations are responsible for the efficient acoustic activation of surface mobility in the simulations. The increase in the effective diffusion coefficient is proportional to the number of the SAW pulses passing through the diffusion region per unit time and a dramatic 4500-fold diffusion enhancement (corresponds to an equivalent temperature increase by ~10 3K ) is predicted in the simulations formore » 15 GHz SAWs. The ability of SAWs to affect atomic-level surface processes has far-reaching implications for the design of new techniques where the acoustic energy serves as an effective substitution for thermal activation in applications where heating must be avoided or rapid switching of surface conditions is required.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge Leadership Computing Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565365
DOE Contract Number:  
CMMI-1436775
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 23; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Materials Science; Physics

Citation Formats

Shugaev, Maxim V., Manzo, Anthony J., Wu, Chengping, Zaitsev, Vladimir Yu., Helvajian, Henry, and Zhigilei, Leonid V. Strong enhancement of surface diffusion by nonlinear surface acoustic waves. United States: N. p., 2015. Web. doi:10.1103/physrevb.91.235450.
Shugaev, Maxim V., Manzo, Anthony J., Wu, Chengping, Zaitsev, Vladimir Yu., Helvajian, Henry, & Zhigilei, Leonid V. Strong enhancement of surface diffusion by nonlinear surface acoustic waves. United States. doi:10.1103/physrevb.91.235450.
Shugaev, Maxim V., Manzo, Anthony J., Wu, Chengping, Zaitsev, Vladimir Yu., Helvajian, Henry, and Zhigilei, Leonid V. Mon . "Strong enhancement of surface diffusion by nonlinear surface acoustic waves". United States. doi:10.1103/physrevb.91.235450.
@article{osti_1565365,
title = {Strong enhancement of surface diffusion by nonlinear surface acoustic waves},
author = {Shugaev, Maxim V. and Manzo, Anthony J. and Wu, Chengping and Zaitsev, Vladimir Yu. and Helvajian, Henry and Zhigilei, Leonid V.},
abstractNote = {The phenomenon of acoustic activation of surface diffusion is investigated in a combined computational and experimental study. The ability of pulsed laser-generated surface acoustic waves (SAWs) to enhance the mobility of small atomic clusters is demonstrated by directly tracking, with fluorescence microscopy, individual Au8 clusters moving on a (111) silicon substrate. A 19-fold increase in the effective diffusion coefficient is measured in room temperature experiments in the presence of SAWs generated by nanosecond pulse laser irradiation at a 100 Hz repetition rate. A strong enhancement of cluster mobility by SAWs is also observed in large-scale molecular dynamics simulations of surface diffusion of small atomic clusters. The analysis of the computational results demonstrates that the nonlinear sharpening of SAWs and the corresponding enrichment of the SAW spectra by high frequency harmonics which are capable of dynamic coupling to the cluster vibrations are responsible for the efficient acoustic activation of surface mobility in the simulations. The increase in the effective diffusion coefficient is proportional to the number of the SAW pulses passing through the diffusion region per unit time and a dramatic 4500-fold diffusion enhancement (corresponds to an equivalent temperature increase by ~103K ) is predicted in the simulations for 15 GHz SAWs. The ability of SAWs to affect atomic-level surface processes has far-reaching implications for the design of new techniques where the acoustic energy serves as an effective substitution for thermal activation in applications where heating must be avoided or rapid switching of surface conditions is required.},
doi = {10.1103/physrevb.91.235450},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 23,
volume = 91,
place = {United States},
year = {2015},
month = {6}
}

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