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  Surface vibrational Raman modes of In: Si(111)(4 x 1) and (8 x 2) nanowires

Speiser, E., Esser, N. N., Wippermann, S. M., & Schmidt, W. G. (2016). Surface vibrational Raman modes of In: Si(111)(4 x 1) and (8 x 2) nanowires. Physical Review B, 94(7): 075417. doi:10.1103/PhysRevB.94.075417.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C94A-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C94B-C
Genre: Journal Article

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 Creators:
Speiser, Eugen1, Author              
Esser, Norbert N.2, Author              
Wippermann, Stefan Martin3, Author              
Schmidt, Wolf Gero4, Author              
Affiliations:
1Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V., Albert-Einstein-Str. 9, 12489 Berlin, Germany, ou_persistent22              
2ISAS-Institute for Analytical Sciences, Department Berlin, Albert-Einstein Str. 9, 12489 Berlin, Germany, ou_persistent22              
3Atomistic Modelling, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863350              
4Lehrstuhl für Theoretische Physik, Universität Paderborn, 33095 Paderborn, Germany, ou_persistent22              

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Free keywords: ENERGY POSITRON DIFFRACTION; METAL-INSULATOR-TRANSITION; QUANTUM CHAINS; ATOM WIRES; SCATTERING; SEMICONDUCTORS; SPECTROSCOPY; TEMPERATURES; INSTABILITY; PHONONS;
 Abstract: High-resolution Raman spectroscopy at low frequencies (< 100 cm(-1)) is used to reinvestigate and identify the surface phonons localized in the first atomic layers of In: Si(111)(4 x 1) and (8 x 2). The frequency and symmetry of low-energy surface phonons are strongly related to surface structure. The measured phonons are assigned to characteristic modes of the quasi-one-dimensional indium nanowires on Si(111) by means of density-functional theory calculations and symmetry considerations. It is found that the low-temperature (8 x 2) and the room-temperature (4 x 1) phases of the In: Si(111) surface are characterized by distinct sets of phonon modes. Strong modifications in Raman spectra upon the phase transition are, on the one hand, related to backfolding induced by symmetric quadruplication of the surface unit cell and, on the other hand, to structural changes within the surface unit cell. These are indications for two distinct structural phases, supporting the first-order transition scenario. The characteristic structural changes are thus verified in detail.

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Language(s): eng - English
 Dates: 2016-08-12
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 94 (7) Sequence Number: 075417 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008