✦ LIBER ✦

Polaron effects on the binding energy of a double donor impurity in quantum wells in an electric field

✍ Scribed by Zi-xin Liu; Xing-yi Li; Xing-li Chu; Yong-chang Huang; Ya Liu

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 151 KB
Volume: 27
Category: Article
ISSN: 0749-6036
DOI: 10.1006/spmi.1999.0795

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✦ Synopsis

The binding energy of the single and double bound polaron bound to a helium-type donor impurity in quantum wells (QWs) subject to a perpendicular electric field are calculated by a variational method. The couplings of an electron and the impurity with various phonon modes are considered. The results show that the cumulative effects of the electron-phonon coupling and the impurity-phonon coupling can contribute appreciably to the binding energy for the single bound polaron but only in some severe conditions for the double bound polaron. They also show that the binding energy is sensitive to the electric field strength. The comparison between the binding energies in the case of the impurity placed at the quantum well center and at the quantum well edge is also given.

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