S. Takahashi
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
S. Takahashi has a total of 15 co-authors. Here are the top co-authors by number of shared publications:
A. Oiwa
Department of Applied Physics and QPEC, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2 shared publicationsK. Yoshida
Department of Applied Physics and QPEC, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2 shared publicationsR. S. Deacon
Department of Applied Physics and QPEC, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2 shared publications- Yasuhiro Tokura
University of Tsukuba
2 shared publications A Oiwa
QPEC and Department of Applied Physics, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan
1 shared publicationK Hirakawa
JST CREST, 4–1–8 Hon-cho, Kawaguchi-shi, Saitama 332–0012, Japan
1 shared publication
Latest Publications
- 14 June 2010
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 104 (24) , 246801
Large Anisotropy of the Spin-Orbit Interaction in a Single InAs Self-Assembled Quantum Dot
The anisotropy of the spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot holding just a few electrons. The SOI energy is evaluated from anticrossing or SOI-induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosinelike function for tilting rotation. Furthermore, the SOI energy is quenched for a specific magnetic field vector. The angular dependence of SOI is found to compare well with calculation of Rashba SOI in a two-dimensional harmonic potential.
- 14 June 2010
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 104 (24) , 246801
Large Anisotropy of the Spin-Orbit Interaction in a Single InAs Self-Assembled Quantum Dot
The anisotropy of the spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot holding just a few electrons. The SOI energy is evaluated from anticrossing or SOI-induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosinelike function for tilting rotation. Furthermore, the SOI energy is quenched for a specific magnetic field vector. The angular dependence of SOI is found to compare well with calculation of Rashba SOI in a two-dimensional harmonic potential.
- Open Access
Large anisotropy of spin-orbit interaction in a single InAs self-assembled quantum dot
Anisotropy of spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot (SAQD) holding just a few electrons. The SOI energy is evaluated from anti-crossing or SOI induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosine-like function for tilting rotation. The SOI energy is even quenched at a specific rotation. These angular dependence compare well to calculation of Rashba SOI in a two-dimensional harmonic potential.
Open AccessLarge anisotropy of spin-orbit interaction in a single InAs self-assembled quantum dot
Anisotropy of spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot (SAQD) holding just a few electrons. The SOI energy is evaluated from anti-crossing or SOI induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosine-like function for tilting rotation. The SOI energy is even quenched at a specific rotation. These angular dependence compare well to calculation of Rashba SOI in a two-dimensional harmonic potential.
- 1 February 2009
- Published by IOP Publishing in Journal of Physics: Conference Series
- Vol. 150 (2) , 022084
Quantitative evaluation of spin-orbit interaction in InAs quantum dots
Influence of spin-orbit interaction (SOI) on the energy spectrum is studied for single uncapped InAs self-assembled quantum dots (SAQDs) holding just a few electrons. We measure Coulomb oscillations with magnetic field, and identify lifting of spin doublets in the low field range and transitions in the ground states with keeping the total angular momentum in the high field range. Both of these features are induced by large Zeeman splitting in the present SAQDs. For the ground state transitions, anti-crossing due to the SOI hybridization between the ground and excited states with opposite spins is observed in the excitation spectra, and the SOI energy of about 0.1 meV is evaluated from the anti-crossing size. This energy is comparable to that of previous report on InAs nanowires, and reproduced by simple calculation using the g-factor also derived in the excitation spectra.
- 1 February 2009
- Published by IOP Publishing in Journal of Physics: Conference Series
- Vol. 150 (2) , 022084
Quantitative evaluation of spin-orbit interaction in InAs quantum dots
Influence of spin-orbit interaction (SOI) on the energy spectrum is studied for single uncapped InAs self-assembled quantum dots (SAQDs) holding just a few electrons. We measure Coulomb oscillations with magnetic field, and identify lifting of spin doublets in the low field range and transitions in the ground states with keeping the total angular momentum in the high field range. Both of these features are induced by large Zeeman splitting in the present SAQDs. For the ground state transitions, anti-crossing due to the SOI hybridization between the ground and excited states with opposite spins is observed in the excitation spectra, and the SOI energy of about 0.1 meV is evaluated from the anti-crossing size. This energy is comparable to that of previous report on InAs nanowires, and reproduced by simple calculation using the g-factor also derived in the excitation spectra.