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The ground-state and lowest excited-state binding energies of a hydrogenic impurity in GaAs parabolicquantum-well wires(QWWs)subjected to external electric and magnetic Gelds are investigated using the finite-differencemethod within the quasi-one-dimensional effective potential model.We define an effective radius ρ_(eff)of a cylindricalQWW,which can describe the strength of the lateral confinement.For the ground state,the position of the largestprobability density of electron in x-y plane is located at a point,while for the lowest excited state,is located on acircularity whose radius is ρ_(eff).The point and circularity are pushed along the left half of the center axis of thequantum-well wire by the electric field dire ted along the right half.When an impurity is located at the point or withinthe circularity,the ground-state or lowest excited-state binding energies are the largest;when the impurity is apart fromthe point or circularity,the ground-state or lowest excited-state binding energies start to decrease.
The ground-state and lowest excited-state binding energies of a hydrogenic impurity in GaAs parabolic quantum-well wires (QWWs) subjected to external electric and magnetic Gelds are investigated using the finite-difference methord within the quasi-one-dimensional effective potential model. define an effective radius ρ_ (eff) of a cylindrical QWW, which can describe the strength of the lateral confinement. For the ground state, the position of the largestprobability density of electron in xy plane is located at a point, while for the lowest excited state , is located on acircularity whose radius is ρ_ (eff). The point and circularity are pushed along the left half of the center axis of the quantum-well wire by the electric field dire ted along the right half. An an impurity is located at the point or withinthe 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 the lowest excited-state binding energies start to decrease.