Voltage Switching Technique for Detecting Nuclear Spin Polarization in a Quantum Dot
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概要
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We have introduced a source–drain voltage switching technique for studying nuclear spins in a vertical double quantum dot. Switching the source–drain voltage between the spin-blockade state and the zero-bias Coulomb blockade state can tune the energy difference between the spin singlet and triplet, and effectively turn on/off the hyperfine interaction. Since the change in the nuclear spin state affects the source–drain current, nuclear spin properties can only be detected by transport measurement. Using this technique, we have succeeded in measuring the timescale of nuclear spin depolarization. Furthermore, combining this technique and an RF ac magnetic field, we successfully detected continuous-wave NMR signals of 75As, 69Ga, and 71Ga, which are contained in a quantum dot.
- 2010-04-25
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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Keiji Ono
Low Temperature Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Seigo Tarucha
Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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Kimitoshi Kono
Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
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Takahashi Ryo
Department of Electrical Engineering, Kyoto University
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