Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters

K. Hitachi; M. Yamamoto; S. Tarucha

doi:10.1103/PhysRevB.74.161301

Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters

K. Hitachi, M. Yamamoto, S. Tarucha

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

A quantum dot (QD) having two tunnel-coupled quantum wires (QWs) was fabricated to probe the QD's spin configuration using the QWs as spin filters. The QWs were adjusted to be either spin-polarized or spin-depolarized under a magnetic field B. The spin filtering effect was only observed for spin-polarized QWs, and singlet and triplet states were distinguished for values of the filling factor 2<ν<4. The spin filtering rate increased due to Zeeman splitting in the QW as the B field was increased, but it decreased dramatically the region of ν<2 due to the cotunneling effect.

Original language	English
Article number	161301
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	74
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.74.161301
Publication status	Published - 19-10-2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "A quantum dot (QD) having two tunnel-coupled quantum wires (QWs) was fabricated to probe the QD's spin configuration using the QWs as spin filters. The QWs were adjusted to be either spin-polarized or spin-depolarized under a magnetic field B. The spin filtering effect was only observed for spin-polarized QWs, and singlet and triplet states were distinguished for values of the filling factor 2<ν<4. The spin filtering rate increased due to Zeeman splitting in the QW as the B field was increased, but it decreased dramatically the region of ν<2 due to the cotunneling effect.",

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AU - Tarucha, S.

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N2 - A quantum dot (QD) having two tunnel-coupled quantum wires (QWs) was fabricated to probe the QD's spin configuration using the QWs as spin filters. The QWs were adjusted to be either spin-polarized or spin-depolarized under a magnetic field B. The spin filtering effect was only observed for spin-polarized QWs, and singlet and triplet states were distinguished for values of the filling factor 2<ν<4. The spin filtering rate increased due to Zeeman splitting in the QW as the B field was increased, but it decreased dramatically the region of ν<2 due to the cotunneling effect.

AB - A quantum dot (QD) having two tunnel-coupled quantum wires (QWs) was fabricated to probe the QD's spin configuration using the QWs as spin filters. The QWs were adjusted to be either spin-polarized or spin-depolarized under a magnetic field B. The spin filtering effect was only observed for spin-polarized QWs, and singlet and triplet states were distinguished for values of the filling factor 2<ν<4. The spin filtering rate increased due to Zeeman splitting in the QW as the B field was increased, but it decreased dramatically the region of ν<2 due to the cotunneling effect.

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