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Electric Effect of Impurity in Square Quantum Wires |
| LI Kui-Hua1;ZHANG Ying-Tao1,2;LI You-Cheng1,3 |
| 1College of Physics, Hebei Normal University, Shijiazhuang 050016
2Institute of Physics, Hebei University of Technology, Tianjin 300130
3CCAST (World Laboratory), PO Box 8730, Beijing 100080 |
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| Cite this article: |
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LI Kui-Hua, ZHANG Ying-Tao, LI You-Cheng 2004 Chin. Phys. Lett. 21 1616-1619 |
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Abstract In the presence of an electric field perpendicular to the axes of the wire, the binding energy of shallow donor impurity in finite square quantum well wires is calculated. For different impurity positions and aspect ratios of the wires, we investigate the Stark shift of the $1s$-like state energy of the impurity by expanding the wavefunction into a two-dimensional Fourier series and by using the variational scheme. It is found that the electric field breaks down the degeneracy of the states for impurities symmetrically positioned within the structure and leads to red-shift or blue-shift of the impurity Stark energy, respectively. Furthermore, the scaling rule of the binding energy will not be valid for the square quantum well wire under the applied electric field.
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| Keywords:
73.21.Hb
71.35.Ji
71.55.Eq
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Published: 01 August 2004
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