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作 者:WANG Sheng WEI Guo-Zhu HAN Yu
机构地区:[1]College of Electronic Science, Daqing Petroleum Institute, Daqing 163318, China [2]College of Sciences, Northeastern University, Shenyang 110004, China [3]International Center for Material Physics, Academia Sinica, Shenyang 110015, China
出 处:《Communications in Theoretical Physics》2009年第11期953-959,共7页理论物理通讯(英文版)
摘 要:The ground-state and lowest excited-state binding energies of a hydrogenic impurity in GaAs parabolic quantum-well wires (Q WWs) subjected to external electric and magnetic fields are investigated using the finite-difference method within the quasi-one-dimensional effective potential model. We define an effective radius Pen of a cylindrical QWW, which can describe the strength of the lateral confinement. For the ground state, the position of the largest probability density of electron in x-y plane is located at a point, while for the lowest excited state, is located on a circularity whose radius is Pen. The point and circularity are pushed along the left haft of the center axis of the quantum-well wire by the electric field dire ted along the right half. When an impurity is located at the point or within the circularity, the ground-state or lowest excited-state binding energies are the largest; when the impurity is apart from the point or circularity, the ground-state or lowest excited-state binding energies start to decrease.
关 键 词:hydrogenic impurity quantum-well wire magnetic field binding energy
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