Spin filter using semiconductor point contacts with spin-orbit interaction

M. Eto; T. Hayashi; Y. Kurotani

doi:10.1063/1.2355279

Spin filter using semiconductor point contacts with spin-orbit interaction

M. Eto, T. Hayashi, Y. Kurotani

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We theoretically study the ballistic transport through a quantum wire with a narrow constriction, "point contact," in the presence of Rashba spin-orbit (SO) interaction. By numerical studies, we find that the conductance is quantized in units of 2e²/h when the constriction changes gradually in space, and that the current is spin-polarized in the transverse direction. This is due to the transition between subbands of different spins during the transport through the point contact. The spin-polarization ratio is determined by the adiabaticity of the transition, which is evaluated by the Landau-Zener theory. The spin polarization of 60% can be realized with experimentally accessible values of the SO interaction strength.

Original language	English
Title of host publication	LOW TEMPERATURE PHYSICS
Subtitle of host publication	24th International Conference on Low Temperature Physics - LT24
Pages	1516-1517
Number of pages	2
DOIs	https://doi.org/10.1063/1.2355279
Publication status	Published - 2006 Dec 1
Event	LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States Duration: 2006 Aug 10 → 2006 Oct 17

Publication series

Name	AIP Conference Proceedings
Volume	850
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
Country/Territory	United States
City	Orlando, FL
Period	06/8/10 → 06/10/17

Keywords

Conductancequantization
Point contact
Rashba
Spin-orbitinteraction
Spinfilter

ASJC Scopus subject areas

Ecology, Evolution, Behavior and Systematics
Ecology
Plant Science
Physics and Astronomy(all)
Nature and Landscape Conservation

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10.1063/1.2355279

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Eto, M, Hayashi, T & Kurotani, Y 2006, Spin filter using semiconductor point contacts with spin-orbit interaction. in LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP Conference Proceedings, vol. 850, pp. 1516-1517, LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24, Orlando, FL, United States, 06/8/10. https://doi.org/10.1063/1.2355279

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abstract = "We theoretically study the ballistic transport through a quantum wire with a narrow constriction, {"}point contact,{"} in the presence of Rashba spin-orbit (SO) interaction. By numerical studies, we find that the conductance is quantized in units of 2e2/h when the constriction changes gradually in space, and that the current is spin-polarized in the transverse direction. This is due to the transition between subbands of different spins during the transport through the point contact. The spin-polarization ratio is determined by the adiabaticity of the transition, which is evaluated by the Landau-Zener theory. The spin polarization of 60% can be realized with experimentally accessible values of the SO interaction strength.",

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AU - Eto, M.

AU - Hayashi, T.

AU - Kurotani, Y.

PY - 2006/12/1

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N2 - We theoretically study the ballistic transport through a quantum wire with a narrow constriction, "point contact," in the presence of Rashba spin-orbit (SO) interaction. By numerical studies, we find that the conductance is quantized in units of 2e2/h when the constriction changes gradually in space, and that the current is spin-polarized in the transverse direction. This is due to the transition between subbands of different spins during the transport through the point contact. The spin-polarization ratio is determined by the adiabaticity of the transition, which is evaluated by the Landau-Zener theory. The spin polarization of 60% can be realized with experimentally accessible values of the SO interaction strength.

AB - We theoretically study the ballistic transport through a quantum wire with a narrow constriction, "point contact," in the presence of Rashba spin-orbit (SO) interaction. By numerical studies, we find that the conductance is quantized in units of 2e2/h when the constriction changes gradually in space, and that the current is spin-polarized in the transverse direction. This is due to the transition between subbands of different spins during the transport through the point contact. The spin-polarization ratio is determined by the adiabaticity of the transition, which is evaluated by the Landau-Zener theory. The spin polarization of 60% can be realized with experimentally accessible values of the SO interaction strength.

KW - Conductancequantization

KW - Point contact

KW - Rashba

KW - Spin-orbitinteraction

KW - Spinfilter

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Spin filter using semiconductor point contacts with spin-orbit interaction

Abstract

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Keywords

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