Effects of Thermal Lattice Vibration on the Effective Potential of Weak-Coupling Bipolaron in a Quantum Dot

• Published in: Communications in theoretical physics Vol. 57; no. 1; pp. 157 - 160
• Main Author: 额尔敦朝鲁 乌云其木格 肖欣 韩超 辛伟
• Format: Journal Article
• Language: English
• Published: 2012
• Subjects: Confinement; Electron-phonon interactions; Joining; Lattice vibration; Quantum dots; Semiconductors; Strength; Variational methods; 半导体量子点; 双极化子; 弱耦合; 晶格热振动; 有效势; 电子温度; 线性组合算子; 量子统计理论
• ISSN: 0253-6102
• DOI: 10.1088/0253-6102/57/1/24

Based on the Huybrechts＇ linear-combination operator, effects of thermal lattice vibration on the effective potential of weak-coupling bipolaron in semiconductor quantum dots are studied by using the LLP variational method and quantum statistical theory. The results show that the absolute value of the induced potential of the bipolaron increases with increasing the electron-phonon coupling strength, but decreases with increasing the temperature and the distance of electrons, respectively; the absolute value of the effective potential increases with increasing the radius of the quantum dot, electron-phonon coupling strength and the distance of electrons, respectively, but decreases with increasing the temperature; the temperature and electron-phonon interaction have the important influence on the formation and state properties of the bipolaron： the bipolarons in the bound state are closer and more stable when the electron-phonon coupling strength is larger or the temperature is lower; the confinement potential and coulomb repulsive potential between electrons are unfavorable to the formation of bipolarons in the bound state.