Quantum-confined Stark shift in electroreflectance of a cylindrical GaN quantum dot

✍ Scribed by Haiyan Gao; Guiguang Xiong; Xiaobo Fenga

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 229 KB
• Volume: 37
• Category: Article
• ISSN: 0026-2692
• DOI: 10.1016/j.mejo.2005.10.011

✦ Synopsis

The electroreflectance (ER) spectra in the presence of the modulated electric field have been employed to study the fine structure of a cylindrical GaN quantum dot (QD), including the light hole and heavy hole interband transitions, and the ER spectra exhibit Franz-Keldysh oscillation characteristics with abscissa of energy (EKE g ). The quantum-confined Stark shift (QCSS) happened when the electric field intensity increased and the light and heavy holes dependent characteristics have been shown. The three-dimensional Schro ¨dinger equation of QD has been calculated within the framework of effective-mass approximation, and the ER indices have been obtained from modulation absorption coefficients using the Seraphin coefficients and the Kramer-Kroning relation.