Hydrogenic donor impurity states of quantum ring in the presence of an electric field

2012 ◽  
Author(s):  
Guangxin Wang ◽  
Xiuzhi Duan ◽  
Lingyan Ai
Keyword(s):  
Electric Field ◽  
Quantum Ring ◽  
Donor Impurity ◽  
Impurity States ◽  
Hydrogenic Donor Impurity ◽  
Hydrogenic Donor

scholarly journals Hydrogenic-Donor Impurity Binding Energy Dependence of the Electric Field in GaAs/AlxGa1−xAs Quantum Rings

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Guangxin Wang ◽  
Xiuzhi Duan ◽  
Wei Chen
Keyword(s):  
Wave Function ◽  
Binding Energy ◽  
Electric Field ◽  
Applied Electric Field ◽  
Donor Impurity ◽  
Electronic Wave ◽  
Hydrogenic Donor Impurity ◽  
Hydrogenic Donor ◽  
Electronic Wave Function ◽  
Radial Thickness

Using a variational method with two-parameter trial wave function and the effective mass approximation, the binding energy of a donor impurity in GaAs/AlxGa1−xAs cylindrical quantum ring (QR) subjected to an external field is calculated. It is shown that the donor impurity binding energy is highly dependent on the QR structure parameters (radial thickness and height), impurity position, and external electric field. The binding energy increases inchmeal as the QR parameters (radial thickness and height) decrease until a maximum value for a central impurity and then begins to drop quickly. The applied electric field can significantly modify the spread of electronic wave function in the QR and shift electronic wave function from the donor position and then leads to binding energy changes. In addition, results for the binding energies of a hydrogenic donor impurity as functions of the impurity position and applied electric field are also presented.

Magnetic Field Effect on the Binding Energy of a Hydrogenic Donor Impurity in Cylindrical Quantum Ring

2013 ◽  
Vol 380-384 ◽  
pp. 4841-4844 ◽  
Author(s):  
Guang Xin Wang ◽  
Xiu Zhi Duan
Keyword(s):  
Magnetic Field ◽  
Binding Energy ◽  
Magnetic Field Effect ◽  
Internal Surface ◽  
Outer Radius ◽  
Quantum Ring ◽  
Donor Impurity ◽  
Hydrogenic Donor Impurity ◽  
Inner Radius ◽  
Hydrogenic Donor

The binding energy of a hydrogenic donor impurity in cylindrical GaAs quantum ring (QR) subjected to an external magnetic field is calculated within the effect mass approximation using variational method. The binding energy as a function of the QR size (the inner radius, the outer radius), the impurity position and the applied magnetic field is investigated. The results demonstrate that the ground state binding energy behaves as an decreasing function of the outer radius, and the magnetic field. Likewise, the binding energy is an increasing function of the inner radius. The binding energy firstly increases and then decreases with shifting the impurity ion from the internal surface of the QR to the external surface, indicating that there is a maximum.

Magnetic Field Effects on Electron Eigenstates in a Concentric Triple Quantum Ring

2010 ◽  
Vol 10 ◽  
pp. 121-130 ◽  
Author(s):  
Hojjatollah K. Salehani ◽  
Mahdi Esmaeilzadeh ◽  
Khosrow Shakouri
Keyword(s):  
Magnetic Field ◽  
Energy Levels ◽  
Quantum Ring ◽  
Dimensional System ◽  
Magnetic Field Effects ◽  
Donor Impurity ◽  
Quantum Rings ◽  
Hydrogenic Donor Impurity ◽  
Hydrogenic Donor ◽  
The Magnetic Field

In this paper, the electronic eigenstates and energy spectra of a two-dimensional system formed by three concentric, coupled, semiconductor quantum rings with a perpendicular magnetic field in the presence and the absence of a single ionized hydrogenic donor impurity are studied. It is found that the magnetic field localizes the electron wave function in the inner rings. The effects of hydrogenic donor on the electronic structure of concentric triple quantum rings are investigated in the both on- and off-center configurations. It is shown that as the donor moves away from the center of the system, the ground state energy decreases monotonically, the degeneracy is lifted and the gap between the energy levels increases. Also, the binding energy of donor impurity increases with increasing magnetic field.

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