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Effects of Magnetic Impurity on Electronic Properties in a Two-Dimensional Quantum Ring

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A theoretical study of magnetic impurity effects on the electronic properties of a two-dimensional quantum ring with parabolic confinement potential is presented by using finite difference method and iterative Arnoldi factorization. The effects of spin-dependent exchange interaction between the electron and magnetic impurity on electronic properties are investigated for both spin-singlet and spin-triplet states. It is shown that the spin-dependent exchange interaction opens energy gaps in the electron energy spectrum and removes two-fold degeneracy of energy levels. The persistent current decreases significantly in the presence of magnetic impurity. The magnetic impurity has maximum effects on the energy spectrum and persistent current if it is located in the average radius of quantum ring. It is also shown that the magnetic impurity acts like a potential barrier for spin-singlet state while, it acts like a potential well for spin-triplet states.
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Keywords: QUANTUM CONFINEMENT; QUANTUM RING AND MAGNETIC IMPURITY; SEMICONDUCTOR NANOSTRUCTURES

Document Type: Research Article

Publication date: 01 May 2013

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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