Browsing by Author "Lu, Hsiao-Mei"

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Effect of Shape and Size on Electron Transition Energies for Nanoscale InAs/GaAs Quantum Rings
(2003-12-01)
Li, Yiming
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Lu, Hsiao-Mei
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友訊交大聯合研發中心
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D Link NCTU Joint Res Ctr
In this paper, we study the impact of the sizes and the shapes of nanoscale semiconductor quantum rings on the electron and hole energy states. A three-dimensional effective one band Schrodinger equation is solved numerically for semiconductor quantum rings with disk, cut-bottom-elliptical, and conical shapes. For small InAs/GaAs quantum rings we have found a sufficient difference in the ground state and excited state (l = -1) electron energies for rings with the same volume but different shapes. Volume dependence of the electron and hole energies can vary over a wide range and depends significantly on the ring shapes. It is found that a non-periodical oscillation of the energy band gap between the lowest electron and hole states as a function of external magnetic fields.