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Phys. Rev. B 77, 241301(R) (2008) [4 pages]

Manipulation of exchange coupling energy in a few-electron double quantum dot

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T. Hatano*, S. Amaha, and T. Kubo
Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan

Y. Tokura
Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan and NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan

Y. Nishi
Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Y. Hirayama†
NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan and SORST, JST, Atsugi-shi, Kanagawa 243-0198, Japan

S. Tarucha
Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan and Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 4 March 2008; published 2 June 2008

We have used a hybrid vertical-lateral double quantum dot to study the excitation energy spectrum for one- and two-electron states, which are effectively formed on top of a certain core shell. We have observed bonding and antibonding states, and exchange coupled singlet and triplet states for the one- and two-electron states, respectively, and derived the interdot tunnel coupling and exchange coupling energies for various parameters of interdot level detuning, central gate voltage and magnetic field. The obtained exchange coupling energy is consistently reproduced by calculation using the Hund-Mulliken method.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.241301
DOI:
10.1103/PhysRevB.77.241301
PACS:
73.63.Kv, 73.23.Hk

*hatano@tarucha.jst.go.jp

†Present address: Department of Physics, Tohoku University, Sendai 980-8578, Japan.

 
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