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Title: In-situ optical transmission electron microscope study of exciton phonon replicas in ZnO nanowires by cathodoluminescence

The cathodoluminescence spectrum of single zinc oxide (ZnO) nanowires is measured by in-situ optical Transmission Electron Microscope. The coupling between exciton and longitudinal optical phonon is studied. The band edge emission varies for different excitation spots. This effect is attributed to the exciton propagation along the c axis of the nanowire. Contrary to free exciton emission, the phonon replicas are well confined in ZnO nanowire. They travel along the c axis and emit at the end surface. Bending strain increases the relative intensity of second order phonon replicas when excitons travel along the c-axis.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ; ;  [3] ;  [1]
  1. International Center for Quantum Materials, School of Physics, Peking University and Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. (China)
  3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
Publication Date:
OSTI Identifier:
22310872
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CATHODOLUMINESCENCE; COUPLING; EXCITATION; EXCITONS; NANOWIRES; PHONONS; QUANTUM WIRES; SPECTRA; STRAINS; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; ZINC OXIDES