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Polaron in a quasi 0D nanocrystal

机译:准0D纳米晶体中的极化子

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摘要

Polaron states in a spherical quantum dot with a spherical symmetric parabolic confinement potential are investigated applying the Feynman variational principle. Effects of the dot radius on the polaron ground state energy level, the self-action potential energy, the mass and the Frohlich electron-phonon-coupling constant are obtained for a spherical quantum dot. The electron-phonon-coupling amplitude derived from the Maxwell equation in a material medium is used. This yields a better upper bound for strong coupling polaron energy in a spherical quantum dot. The polaron mass, energy and self-action potential energy are found to have a monotonous decrease as the structures' radius increases. As the spherical quantum dot radius is reduced the regimes of weak and intermediate coupling polaron shorten and the strong coupling polaron region broadens and extends into weak and intermediate ones. The main contribution to polaron energy and mass comes from the self-action potential.
机译:应用费曼变分原理研究了具有球形对称抛物线约束势的球形量子点中的极化子态。对于球形量子点,获​​得了点半径对极化子基态能级,自作用势能,质量和Frohlich电子-声子耦合常数的影响。在材料介质中使用了从麦克斯韦方程式导出的电子-声子耦合振幅。这为球形量子点中的强耦合极化子能量产生了更好的上限。发现极化子质量,能量和自作用势能随着结构半径的增加而单调减少。随着球形量子点半径的减小,弱耦合极化子和中等耦合极化子的作用域缩短,而强耦合极化子区域变宽并扩展为弱和中等极化子。对极化子能量和质量的主要贡献来自自作用电位。

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