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Hybridization of Surface Waves with Organic Adlayer Librations: A Helium Atom Scattering and Density Functional Perturbation Theory Study of Methyl-Si(111)

Brown, Ryan D. and Hund, Zachary M. and Campi, Davide and O'Leary, Leslie E. and Lewis, Nathan S. and Bernasconi, M. and Benedek, G. and Sibener, S. J. (2013) Hybridization of Surface Waves with Organic Adlayer Librations: A Helium Atom Scattering and Density Functional Perturbation Theory Study of Methyl-Si(111). Physical Review Letters, 110 (15). Art. No. 156102. ISSN 0031-9007. doi:10.1103/PhysRevLett.110.156102. https://resolver.caltech.edu/CaltechAUTHORS:20130517-131623698

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Abstract

The interplay of the librations of a covalently bound organic adlayer with the lattice waves of an underlying semiconductor surface was characterized using helium atom scattering in conjunction with analysis by density functional perturbation teory. The Rayleigh wave dispersion relation of CH_(3)- and CD_(3)-terminated Si(111) surfaces was probed across the entire surface Brillouin zone by the use of inelastic helium atom time-of-flight experiments. The experimentally determined Rayleigh wave dispersion relations were in agreement with those predicted by density functional perturbation theory. The Rayleigh wave for the CH_(3)- and CD_(3)-terminated Si(111) surfaces exhibited a nonsinusoidal line shape, which can be attributed to the hybridization of overlayer librations with the vibrations of the underlying substrate. This combined synthetic, experimental, and theoretical effort clearly demonstrates the impact of hybridization between librations of the overlayer and the substrate lattice waves in determining the overall vibrational band structure of this complex interface.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.110.156102DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.110.156102PublisherUNSPECIFIED
ORCID:
AuthorORCID
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2013 American Physical Society. Received 1 February 2013; published 9 April 2013. S. J. S. would like to acknowledge the support of the Air Force Office of Scientific Research Grant No. FA9550-10-1-0219, and the Material Research Science and Engineering Center at the University of Chicago for infrastructure support. N. S. L. acknowledges support from NSF-CHE1214152, and L. E. O. was funded by a Link foundation Energy fellowship.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-10-1-0219
University of Chicago Material Research Science and Engineering CenterUNSPECIFIED
NSFCHE1214152
Link Foundation Energy FellowshipUNSPECIFIED
Issue or Number:15
Classification Code:PACS: 68.35.Ja, 63.20.D-, 68.47.Fg, 79.20.Rf
DOI:10.1103/PhysRevLett.110.156102
Record Number:CaltechAUTHORS:20130517-131623698
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130517-131623698
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38562
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:20 May 2013 21:10
Last Modified:09 Nov 2021 23:38

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