Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/MxZn1-xO quantum well

doi:10.1088/1674-1056/24/9/097105

中国物理B ›› 2015, Vol. 24 ›› Issue (9): 97105-097105.doi: 10.1088/1674-1056/24/9/097105

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well

赵凤岐, 张敏, 白金花

College of Physics and Electronic Information, Inner Mongolia Normal University, Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Hohhot 010022, China

收稿日期:2015-02-06 修回日期:2015-04-10 出版日期:2015-09-05 发布日期:2015-09-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11264027 and 11364030), the Project of Prairie Excellent Specialist of Inner Mongolia, China, and the “Thousand, Hundred and Ten” Talent Training Project Foundation of Inner Mongolia Normal University, China (Grant No. RCPY-2-2012-K-039).

Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well

Zhao Feng-Qi (赵凤岐), Zhang Min (张敏), Bai Jin-Hua (白金花)

College of Physics and Electronic Information, Inner Mongolia Normal University, Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Hohhot 010022, China

Received:2015-02-06 Revised:2015-04-10 Online:2015-09-05 Published:2015-09-05
Contact: Zhao Feng-Qi E-mail:fqzhao@imnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11264027 and 11364030), the Project of Prairie Excellent Specialist of Inner Mongolia, China, and the “Thousand, Hundred and Ten” Talent Training Project Foundation of Inner Mongolia Normal University, China (Grant No. RCPY-2-2012-K-039).

摘要/Abstract

摘要：

We investigated the properties of polarons in a wurtzite ZnO/Mg_xZn_1-xO quantum well by adopting a modified Lee-Low-Pines variational method, giving the ground state energy, transition energy, and phonon contributions from various optical-phonon modes to the ground state energy as functions of the well width and Mg composition. In our calculations, we considered the effects of confined optical phonon modes, interface-optical phonon modes, and half-space phonon modes, as well as the anisotropy of the electron effective band mass, phonon frequency, and dielectric constant. Our numerical results indicate that the electron-optical phonon interactions importantly affect the polaronic energies in the ZnO/Mg_xZn_1-xO quantum well. The electron-optical phonon interactions decrease the polaron energies. For quantum wells with narrower wells, the interface optical phonon and half-space phonon modes contribute more to the polaronic energies than the confined phonon modes. However, for wider quantum wells, the total contribution to the polaronic energy mainly comes from the confined modes. The contributions of the various phonon modes to the transition energy change differently with increasing well width. The contribution of the half-space phonons decreases slowly as the QW width increases, whereas the contributions of the confined and interface phonons reach a maximum at d ≈ 5.0 nm and then decrease slowly. However, the total contribution of phonon modes to the transition energy is negative and increases gradually with the QW width of d. As the composition x increases, the total contribution of phonons to the ground state energies increases slowly, but the total contributions of phonons to the transition energies decrease gradually. We analyze the physical reasons for these behaviors in detail.

关键词: wurtzite quantum well, electron-optical phonon interaction, polaron energy

Abstract:

Key words: wurtzite quantum well, electron-optical phonon interaction, polaron energy

中图分类号: (Polarons and electron-phonon interactions)

71.38.-k

73.21.Fg (Quantum wells) 63.20.kd (Phonon-electron interactions)

赵凤岐, 张敏, 白金花. Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well[J]. 中国物理B, 2015, 24(9): 97105-097105.

Zhao Feng-Qi (赵凤岐), Zhang Min (张敏), Bai Jin-Hua (白金花). Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well[J]. Chin. Phys. B, 2015, 24(9): 97105-097105.

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Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well

Effects of electron-optical phonon interactions on the polaron energy in a wurtzite ZnO/M_xZn_1-xO quantum well

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