An Investigation of Magnetic Field Effects on Energy States for Nanoscale InAs/GaAs Quantum Rings and Dots(<Special Issue>the IEEE International Conference on SISPAD '02)
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概要
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In this paper, we investigate the electron-hole energy states and energy gap in three-dimensional (3D) InAs/GaAs quantum rings and dots with different shapes under external magnetic fields. Our realistic model formulation includes : (i) the effective mass Hamiltonian in non-parabolic approximation for electrons, (ii) the effective mass Hamiltonian in parabolic approximation for holes, (iii) the position- and energy-dependent quasi-particle effective mass approximation for electrons, (iv) the finite hard wall confinement potential, and (v) the Ben Daniel-Duke boundary conditions. To solve the 3D nonlinear problem without any fitting parameters, we have applied the nonlinear iterative method to obtain self-consistent solutions. Due to the penetration of applied magnetic fields into torus ring region, for ellipsoidal- and rectangular-shaped quantum rings we find nonperiodical oscillations of the energy gap between the lowest electron and hole states as a function of external magnetic fields. The nonperiodical oscillation is different from ID periodical argument and strongly dependent on structure shape and size. The result is useful to study magneto-optical properties of the nanoscale quantum rings and dots.
- 社団法人電子情報通信学会の論文
- 2003-03-01
著者
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LI Yiming
National Nano Device Labs.
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Lu H‐m
Univ. Illinois Il Usa
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Lu Hsiao-mei
Department Of Bioengineering University Of Illinois At Chicago
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Lu Hsiao-mei
Department Of Bioengineering University Of Illinois
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Li Yiming
National Chiao Tung Univ. Hsinchu Twn
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Li Yiming
National Nano Device Laboratories:microelectronics And Information Systems Research Center National
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- An Investigation of Magnetic Field Effects on Energy States for Nanoscale InAs/GaAs Quantum Rings and Dots(the IEEE International Conference on SISPAD '02)
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- Geometric Variations and Magnetic Field Effects on Electron Energy States of InAs/GaAs Quantum Rings
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