Liu Zi-xin (刘自信)a, Huang Yong-chang (黄永畅)b, Liu Ya (刘亚)b, Jia Tian-qing (贾天卿)c
a Department of Physics, Henan Normal University, Xinxiang 453002, China; b Department of Applied Physics, Beijing Polytechnic University, Beijing 100022, China; c Department of Physics, Tongji University, Shanghai 200092, China
Abstract We have proposed the Hamiltonian of the single or double polaron bound to a helium-type donor impurity in semiconductor quantum wells (QWs) in the case of positively charged donor center and neutral donor center. The couplings of an electron with various phonon modes are considered; in particular, the interaction of the impurity with the various phonon modes is included. We have calculated the binding energy of a bound polaron in Al(xl)Ga1-(xl)As/GaAs/Al(xr)Ga1-(xr) As symmetric and asymmetric QWs. The results are obtained as a function of barrier height (or equivalently of Al concent ration x), well width, and the position of impurity in the QWs. Our numerical calculations show clearly that for a thin well the cumulative effects of the electron-phonon coupling and the impurity-phonon coupling can contribute appreciably to the donor binding energy. The enhancement of polaronic effect is also found in the case of ionized donor.
Received: 29 October 1998
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 69406004) and by the Natural Science Foundati on of Henan Province (Grant No. 994050400), China.
Cite this article:
Liu Zi-xin (刘自信), Huang Yong-chang (黄永畅), Liu Ya (刘亚), Jia Tian-qing (贾天卿) DOUBLE BOUND POLARON IN QUANTUM WELLS 1999 Acta Physica Sinica (Overseas Edition) 8 361
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