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

Journal Article · Mon Aug 18 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4893444· OSTI ID:22310872

Yang, Shize ^[1]; Tian, Xuezeng; Wang, Lifen; Wei, Jiake; Qi, Kuo; Li, Xiaomin; Xu, Zhi; Wang, Wenlong; Zhao, Jimin; Bai, Xuedong ^[2]; Wang, Enge ^[1]

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1. International Center for Quantum Materials, School of Physics, Peking University and Collaborative Innovation Center of Quantum Matter, Beijing (China)
2. 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, Vol. 105, Issue 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CATHODOLUMINESCENCE
COUPLING
EXCITATION
EXCITONS
NANOWIRES
PHONONS
QUANTUM WIRES
SPECTRA
STRAINS
SURFACES
TRANSMISSION ELECTRON MICROSCOPY
ZINC OXIDES