Interference effects of helical current: Geometry-dependent spin polarization of transmitted electrons

Shumpei Masuda; Yoshio Kuramoto

doi:10.1103/PhysRevB.85.195327

Interference effects of helical current: Geometry-dependent spin polarization of transmitted electrons

Shumpei Masuda^*, Yoshio Kuramoto

^*Corresponding author for this work

Not published at Aalto University

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

Abstract

Quantum interference effects of the helical spin current are explored in two-dimensional topological insulators by means of a one-dimensional chain model that simulates the edge states. Peculiar transport properties of the circular edge are revealed in terms of an interferometer with two or three leads. The spin of transmitted electrons changes according to its kinetic energy and the arc lengths of the interferometer. It is also shown that the interferometer with three leads can generate spin polarized current from injection of spin unpolarized electrons.

Original language	English
Article number	195327
Number of pages	8
Journal	Physical Review B
Volume	85
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevB.85.195327
Publication status	Published - 29 May 2012
MoE publication type	A1 Journal article-refereed

Keywords

HGTE QUANTUM-WELLS
CONTACTS
STATE

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10.1103/PhysRevB.85.195327

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title = "Interference effects of helical current: Geometry-dependent spin polarization of transmitted electrons",

abstract = "Quantum interference effects of the helical spin current are explored in two-dimensional topological insulators by means of a one-dimensional chain model that simulates the edge states. Peculiar transport properties of the circular edge are revealed in terms of an interferometer with two or three leads. The spin of transmitted electrons changes according to its kinetic energy and the arc lengths of the interferometer. It is also shown that the interferometer with three leads can generate spin polarized current from injection of spin unpolarized electrons.",

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AU - Kuramoto, Yoshio

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AB - Quantum interference effects of the helical spin current are explored in two-dimensional topological insulators by means of a one-dimensional chain model that simulates the edge states. Peculiar transport properties of the circular edge are revealed in terms of an interferometer with two or three leads. The spin of transmitted electrons changes according to its kinetic energy and the arc lengths of the interferometer. It is also shown that the interferometer with three leads can generate spin polarized current from injection of spin unpolarized electrons.

KW - HGTE QUANTUM-WELLS

KW - CONTACTS

KW - STATE

U2 - 10.1103/PhysRevB.85.195327

DO - 10.1103/PhysRevB.85.195327

M3 - Article

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JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 19

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Interference effects of helical current: Geometry-dependent spin polarization of transmitted electrons

Abstract

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