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 | |
| Publication status | Published - 19-10-2006 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters. / Hitachi, Keisuke; Yamamoto, M.; Tarucha, S.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 74, No. 16, 161301, 19.10.2006.Research output: Contribution to journal › Article
TY - JOUR
T1 - Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters
AU - Hitachi, Keisuke
AU - Yamamoto, M.
AU - Tarucha, S.
PY - 2006/10/19
Y1 - 2006/10/19
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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U2 - 10.1103/PhysRevB.74.161301
DO - 10.1103/PhysRevB.74.161301
M3 - Article
AN - SCOPUS:33749827738
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 16
M1 - 161301
ER -