FU Xuewen, GUO Wanlin, FENG Ji, LI Ju and YU Dapeng, et al. Tailoring Exciton Dynamics by Elastic Strain-Gradient in Semiconductors. Adv. Mater. 2014, 26, 2572–2579.

Tailoring Exciton Dynamics by Elastic Strain-Gradient in Semiconductors

Xuewen Fu1,†, Cong Su2,4,†, Qiang Fu1, Xinli Zhu1, Rui Zhu1, Chuanpu Liu1, Zhimin Liao1, Jun Xu1, Wanlin Guo3,*, Ji Feng2,*, Ju Li4,* andDapeng Yu1,*

Article first published online: 27 JAN 2014

DOI: 10.1002/adma.201305058

Author Information
1State Key Laboratory for Mesoscopic Physics and Electron Microscopy Laboratory, School of Physics, Peking University, and Collaborative Innovation Center of Quantum Matter, Beijing, China
2International Center for Quantum Materials, School of Physics, Peking University and Collaborative Innovation Center of Quantum Matter, Beijing, China
3Key Laboratory of Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, China
4Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

These authors contributed equally to this work.

*E-mail: yudp@pku.edu.cn, jfeng11@pku.edu.cn, liju@mit.edu, wlguo@nuaa.edu.cn

Publication History
Issue published online: 16 APR 2014
Article first published online: 27 JAN 2014
Manuscript Revised: 8 NOV 2013
Manuscript Received: 10 OCT 2013

Keywords:
strain-gradient;exciton dynamics;ZnO microwire;pure bending;cathodoluminescence

Abstract
In purely bent ZnO microwires, the excitons can be effectively driven and concentrated by the elastic strain-gradient towards the tensile outer side of the purely bent wire. Experimental and theoretical approaches are combined to investigate the dynamics of excitons in an inhomogeneous strain field with a uniform elastic strain-gradient. Cathodoluminescence spectroscopy analysis on purely bent ZnO microwires verifies that excitons can be effectively driven and concentrated along the elastic strain-gradient.

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