Vibronic coupling and band gap trends in CuGeO3 nanorods

Kenneth R. O'Neal, Amal al-Wahish, Zhaoqian Li, Peng Chen, Jae Wook Kim, Sang-Wook Cheong, Guy Dhalenne, Alexandre Revcolevschi, Xue-Tai Chen, and Janice L. Musfeldt
Phys. Rev. B 96, 075437 – Published 28 August 2017
PDFHTMLExport Citation
Abstract
Authors
Article Text
  • INTRODUCTION
  • METHODS
  • RESULTS AND DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    We measured the optical response of CuGeO3 nanorods in order to reveal size effects on the electronic properties. The vibronically activated d-to-d color band excitations are activated by the 131 and 478 cm−1 phonons, with the relative contribution of the lower frequency O-Cu-O bending mode increasing with decreasing size until it dominates the process. We also uncover trends in the direct band gap, with the charge transfer edge hardening with decreasing size. These findings advance the understanding of size effects in low-dimensional copper oxides.

    • Figure
    • Figure
    • Figure
    • Received 12 May 2017
    • Revised 27 July 2017

    DOI:https://doi.org/10.1103/PhysRevB.96.075437

    ©2017 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Band gapChemical bondingLattice dynamics
    1. Physical Systems
    Nanowires
    1. Techniques
    Fourier transform infrared spectroscopyRaman spectroscopy
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Kenneth R. O'Neal1, Amal al-Wahish1, Zhaoqian Li2, Peng Chen1, Jae Wook Kim3, Sang-Wook Cheong3, Guy Dhalenne4, Alexandre Revcolevschi4, Xue-Tai Chen5, and Janice L. Musfeldt1,6

    • 1Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
    • 2Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China
    • 3Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • 4SP2M-ICMMO UMR-CNRS 8182, Université Paris-Sud, 91405 Orsay Cedex, France
    • 5State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, 210023, People's Republic of China
    • 6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

    Article Text (Subscription Required)

    Click to Expand

    Supplemental Material (Subscription Required)

    Click to Expand

    References (Subscription Required)

    Click to Expand
    Issue

    Vol. 96, Iss. 7 — 15 August 2017

    Reuse & Permissions
    Access Options
    CHORUS

    Article Available via CHORUS

    Download Accepted Manuscript
    Author publication services for translation and copyediting assistance advertisement

    Authorization Required

    Log In
    Other Options
    ×

    Download & Share

    PDFExportReuse & PermissionsCiting Articles (5)
    ×

    Images

    ×

    Sign up to receive regular email alerts from Physical Review B

    Log In

    Cancel
    ×

    Search

    Article Lookup

    Paste a citation or DOI
    Enter a citation
    ×