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 journalArticle

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 languageEnglish
Article number161301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number16
DOIs
Publication statusPublished - 19-10-2006

Fingerprint

Semiconductor quantum wires
quantum wires
Semiconductor quantum dots
tunnels
Tunnels
quantum dots
Spectroscopy
filters
spectroscopy
Magnetic fields
atomic energy levels
probes
configurations
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{2f5aa7e091b241aa8ea808175f7e21bd,
title = "Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters",
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.",
author = "K. Hitachi and M. Yamamoto and S. Tarucha",
year = "2006",
month = "10",
day = "19",
doi = "10.1103/PhysRevB.74.161301",
language = "English",
volume = "74",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "16",

}

Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters. / Hitachi, K.; 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 journalArticle

TY - JOUR

T1 - Spin selective spectroscopy of a quantum dot using tunnel-coupled quantum wires as spin filters

AU - Hitachi, K.

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.

UR - http://www.scopus.com/inward/record.url?scp=33749827738&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749827738&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.74.161301

DO - 10.1103/PhysRevB.74.161301

M3 - Article

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 -