Three-Electron Systems in Quantum Nanostructures : Ground State Transition from a Spin-Doublet State to a Spin-Quartet State(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The ground state and the lowest excited state of three electrons confined in quantum structures (quantum dots) are calculated. In general, the ground state is a spin-doublet one in a small dot, level crossing occurs as the dot size increases, and the ground state is a spin-quartet state in a large dot. It is found that the spin-quartet ground state is more likely to be realized in a quantum ring (QR) than in a harmonic confinement. In a narrow QR, two-electron exchanges are unlikely to occur because of the large Coulomb barrier while three-electron exchanges are little suppressed, leading to the fully spinpolarized (spin-quartet) ground state. The present calculation conforms to Herring's theorem that the ground state of three spin-1/2 fermions on a one-dimensional ring is a fully spin-polarized one if the repulsive interaction between fermions is sufficiently strong. The extensions of the present result to more complicated cases are also discussed.
- 社団法人日本物理学会の論文
- 2005-04-15
著者
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SAIGA Yasuhiro
Department of Mathematics and Statistics, University of Melbourne
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Saiga Yasuhiro
Department Of Physics Nagoya University
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HIRASHIMA Dai
Department of Physics, Nagoya University
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Hirashima Dai
Department Of Physics Nagoya University
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USUKURA Junko
Department of Physics, Tokyo University of Science
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Usukura Junko
Department Of Physics Tokyo University Of Science
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