The ground-state lifetime of polaron in a parabolic quantum dot |
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Authors: | Yu Yi-Fu Xiao Jing-Lin Yin Ji-Wen and Wang Zi-Wu |
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Institution: | College of Physics and Electronic Information Inner
Mongolia National University, Tongliao 028043, China; Department of Physic and Electronic Information
Engineering, Chifeng
College, Chifeng 024000, China |
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Abstract: | This paper reports that the ground-state energy of polaron was
obtained with strong electron-LO-phonon coupling by using a
variational method of the Pekar type in a parabolic quantum dot.
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 change of the
polaron lifetime. Numerical calculations are performed and the
results illustrate that the ground-state lifetime of the polaron will
increase with increasing the ground-state energy of polaron and
decrease with increasing the electron-LO-phonon coupling strength,
the confinement length of the quantum dot and the temperature. |
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Keywords: | quantum dot polaron lifetime |
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