Singlet--Triplet Mixing Due to $g$-Factor Mismatch in Double Quantum Dot
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概要
- 論文の詳細を見る
Two electron spins form the spin singlet or triplet state if these spins have the same $g$-factor value, or a mix state consisting of both the singlet and triplet states if these spins have different $g$-factor values. It is considered that two energy levels of electrons are formed in a double quantum dot device for use in quantum information processing; however, the $g$-factors of the electrons have not been treated as an important factor because they cannot be changed easily in experiments. We introduce a numerical calculation method for the singlet--triplet mix state due to the $g$-factor mismatch in double quantum dots. It is found that this mismatch changes the energy levels of the original singlet and triplet states; thus, it affects the intersecting points of the energy levels of the singlet and triplet states where a dynamic nuclear polarization appears via hyperfine interaction.
- 2011-04-25
著者
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TAKAHASHI Ryo
Department of Mathematical Sciences Faculty of Science Shinshu University
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Tarucha Seigo
Department Of Applied Physics School Of Engineering University Of Tokyo
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Kono Kimitoshi
Department Of Physics Faculty Of Science University Of Tokyo
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Ono Keiji
Low Temperature Physics Laboratory Riken
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Tarucha Seigo
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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Kono Kimitoshi
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Takahashi Ryo
Department of Electrical Engineering, Kyoto University
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