Electronic states and tunneling times in coupled self-assembled quantum dots |
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| Institution: | 1. Instituto de Fı́sica, Universidad Autónoma de Puebla, Apartado Postal J-48, Puebla 72570, Mexico;2. Department of Physics and Astronomy and Condensed Matter and Surface Science Program, Ohio University, Athens, OH 45701, U.S.A.;1. Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, Kolkata, 700098, India;2. Department of Electronic Science, University of Calcutta, Kolkata, 700009, India;3. Materials Science Centre, Indian Institute of Technology, Kharagpur, 721302, India;1. A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;2. Institute of Physics and Chemistry, Mordovia State University, 430005 Saransk, Russia;3. Dept. of Computer Science & Engineering, National Institute of Technical Teachers'' Training and Research, Kolkata, India |
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| Abstract: | Electron energy levels in single dots, and energy splitting and tunneling times in stacked quantum dots are calculated as functions of structure parameters. An effective mass approach is used to solve the Schrödinger equation for cylindrical dots with finite confinement potentials. Strong confinement due to small sizes produces quantized energy levels in single dots and strong interactions of the wavefunctions with adjacent dots. This electronic coupling induces significant energy splittings and short tunneling times for characteristic structures used in experiments. This coupling may even yield coherent artificial molecular states with different optical properties. |
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