Spin-polarized transport in Rashba quantum point contacts

T. Kita; T. Kakegawa; M. Akabori; S. Yamada

doi:10.1016/j.physe.2003.12.046

Spin-polarized transport in Rashba quantum point contacts

T. Kita, T. Kakegawa, M. Akabori, S. Yamada^*

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e²/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e²/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e²/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.

Original language	English
Pages (from-to)	464-467
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	22
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physe.2003.12.046
Publication status	Published - 2004 Apr 1
Externally published	Yes
Event	15th International Conference on ELectronic Propreties - Nara, Japan Duration: 2003 Jul 14 → 2003 Jul 18

Keywords

Conductance quantization
Quantum point contacts
Quantum wire
Spin-orbit interaction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1016/j.physe.2003.12.046

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title = "Spin-polarized transport in Rashba quantum point contacts",

abstract = "Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.",

keywords = "Conductance quantization, Quantum point contacts, Quantum wire, Spin-orbit interaction",

author = "T. Kita and T. Kakegawa and M. Akabori and S. Yamada",

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doi = "10.1016/j.physe.2003.12.046",

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note = "15th International Conference on ELectronic Propreties ; Conference date: 14-07-2003 Through 18-07-2003",

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TY - JOUR

T1 - Spin-polarized transport in Rashba quantum point contacts

AU - Kita, T.

AU - Kakegawa, T.

AU - Akabori, M.

AU - Yamada, S.

PY - 2004/4/1

Y1 - 2004/4/1

N2 - Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.

AB - Two types of quantum point contacts (QPCs), side-gate quantum wire and split-gate QPCs, were fabricated at high In-content InGaAs/InAlAs single heterojunction which confines two-dimensional electron gas revealing strong Rashba spin-orbit interaction. In the side-gate quantum wire QPC, the conductance quantization in unit of 0.5(2e2/h) was mostly observed in the various samples with different dimensions. This is in contrast to the result in the split-gate QPC, where we confirmed usual (2e2/h) conductance quantization. Since those results were observed under zero magnetic field, the 0.5(2e2/h) quantization could be attributed not to the spin splitting but to the possible spin polarized transport due to the mode coupling between the one-dimensional subbands expected in sufficiently narrow adiabatic constrictions.

KW - Conductance quantization

KW - Quantum point contacts

KW - Quantum wire

KW - Spin-orbit interaction

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DO - 10.1016/j.physe.2003.12.046

M3 - Conference article

AN - SCOPUS:1842734101

SN - 1386-9477

VL - 22

SP - 464

EP - 467

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-3

T2 - 15th International Conference on ELectronic Propreties

Y2 - 14 July 2003 through 18 July 2003

ER -

Spin-polarized transport in Rashba quantum point contacts

Abstract

Keywords

ASJC Scopus subject areas

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