The binding energies of a hydrogenic impurity located at the center and off-center of a multilayered quantum wire (MLQW) in the presence of magnetic field are studied within the framework of the effective-mass approximation. The MLQW consists of a GaAs core wire coated by a cylindrical shell and embedded in the bulk A variational trial wave function is proposed. It is found for a small wire radius that the ground state binding energy of a hydrogenic impurity located at the center of a MLQW behaves very differently from that of a single-layered quantum wire (SLQW). The calculation shows that the binding energy depends on the potential profiles, potential barrier height, impurity position, shell thickness, magnetic field, and the difference between the Al concentration contained in the shell and bulk regions. Our trial function is also able to reproduce the binding energies of a hydrogenic impurity located at the center of a SLQW, good agreement with the previous results is obtained.
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1 July 2002
Research Article|
July 01 2002
Donor impurity on-center and off-center in multilayered quantum wires in the presence of magnetic field
Cheng-Ying Hsieh
Cheng-Ying Hsieh
Deh Yu College of Nursing and Management, Keelung 203, Taiwan, Republic of China
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J. Appl. Phys. 92, 484–490 (2002)
Article history
Received:
November 26 2001
Accepted:
March 27 2002
Citation
Cheng-Ying Hsieh; Donor impurity on-center and off-center in multilayered quantum wires in the presence of magnetic field. J. Appl. Phys. 1 July 2002; 92 (1): 484–490. https://doi.org/10.1063/1.1480121
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