In-situ optical transmission electron microscope study of exciton phonon replicas in ZnO nanowires by cathodoluminescence
- International Center for Quantum Materials, School of Physics, Peking University and Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
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.
- OSTI ID:
- 22310872
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 105; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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