Topological aspects of excitons in artificial structure |
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| Authors: | Masami Kumagai Akihito Taguchi Toshihide Takagahara Takahisa Ohno Kousuke Yakubo |
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| Institution: | 1. NTT Basic Research Labs, Japan;2. Department of Electronics and Information Science, Kyoto, Institute of Technology, Japan;3. Computational Materials Science Center, National Institute for Materials Science, Japan;4. Department of Applied Physics, Hokkaido University, Japan;1. CEA, DAM, CESTA, F-33114 Le Barp, France;2. Laboratoire de Tribologie et Dynamique des Systèmes UMR-CNRS 5513, Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France;3. Institut Universitaire de France, 75005 Paris, France;1. Research Center of Laser Fusion, China Academy of Engineering Physics, Research Center of Laser Fusion, Mianyang 621900, People’s Republic of China;2. Science and Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China;3. College of Physical Science and Technology, Sichuan University, Chengdu 610065, People’s Republic of China;1. Department of Computer Science, Applied Mathematics and Statistics, University of Girona, Spain;2. Department of Architecture and Computers Technology, University of Girona, Spain;1. Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan;2. Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Otsu, Shiga 520-2194, Japan;1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China;2. Science and Technology on Aircraft Control Laboratory, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China |
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| Abstract: | The exciton properties of thin nanotube structures are investigated theoretically. Anisotropic size dependencies have been found in the exciton binding energy, the kinetic energy for the relative motions of an electron and a hole, and the wavefunction. These anisotropies arise from the different boundary conditions in the tube-length and circumferential directions, namely, the topological features of nanotubes. We also found that it is possible to change the topology of exciton wavefunctions by varying the tube-length and the tube-radius. These findings suggest that the optical properties of nanotubes such as oscillator strength or nonlinear susceptibilities can be controlled by tuning the structural parameters, thus yielding a novel guiding principle for designing optical functional materials. |
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