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The Ground-State Lifetime of Polaron in Disk-Shape Quantum Dot

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Abstract

The ground-state lifetime of polaron in disk-shape quantum dot (QD) has been investigated by using the variational method of Pekar type. Quantum transition is occurred in the quantum system due to the electron-phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the changing of the polaron lifetime. The result shows that the ground-state lifetime increases with the increasing of the ground-state energy and decreases with the increasing of the electron-LO-phonon coupling strength, the temperature and the confinement length. We also see that the influence of the longitudinal confinement length on the lifetime is larger than the transverse confinement length.

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Acknowledgements

This project was supported by the National Science Foundation of China. (No. 10747002), the Research Science Project for the Colleges and Universities of Inner Mongolia Autonomous Region (No. NJzy11218) and the Natural Science Foundation of Inner Mongolia (2011MS0102).

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Authors and Affiliations

  1. Department of Physics and Electronic Informational Engineering, Inner Mongolia Chifeng College, Chifeng, 024000, China

    Hong-juan Li

  2. College of Physics and Electronic Information, Inner Mongolian University for Nationalities, Tongliao, 028043, China

    Jing-lin Xiao

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  1. Hong-juan Li
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  2. Jing-lin Xiao
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Correspondence to Hong-juan Li.

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Li, Hj., Xiao, Jl. The Ground-State Lifetime of Polaron in Disk-Shape Quantum Dot. J Low Temp Phys 168, 57–62 (2012). https://doi.org/10.1007/s10909-012-0613-8

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  • DOI: https://doi.org/10.1007/s10909-012-0613-8

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