A triangular triple quantum dot with tunable tunnel couplings

A. Noiri, K. Kawasaki, T. Otsuka, T. Nakajima, J. Yoneda, S. Amaha, M. R. Delbecq, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

研究成果: Article査読

14 被引用数 (Scopus)

抄録

A two-dimensional arrangement of quantum dots (QDs) with finite inter-dot tunnel coupling provides a promising platform for studying complicated spin correlations as well as for constructing large-scale quantum computers. Here, we fabricate a tunnel-coupled triangular triple QD with a novel gate geometry in which three dots are defined by positively biasing the surface gates. At the same time, the small area in the center of the triangle is depleted by negatively biasing the top gate placed above the surface gates. The size of the small center depleted area is estimated from the Aharonov-Bohm oscillation measured for the triangular channel but incorporating no gate-defined dots, with a value consistent with the design. With this approach, we can bring the neighboring gate-defined dots close enough to one another to maintain a finite inter-dot tunnel coupling. We finally confirm the presence of the inter-dot tunnel couplings in the triple QD from the measurement of tunneling current through the dots in the stability diagram. We also show that the charge occupancy of each dot and that the inter-dot tunnel couplings are tunable with gate voltages.

本文言語English
論文番号084004
ジャーナルSemiconductor Science and Technology
32
8
DOI
出版ステータスPublished - 2017 7 19
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学
  • 材料化学

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