0.7 anomaly and magnetotransport of disordered quantum wires

M. Czapkiewicz; P. Zagrajek; J. Wróbel; G. Grabecki; K. Fronc; T. Dietl; Y. Ohno; S. Matsuzaka; H. Ohno

doi:10.1209/0295-5075/82/27003

0.7 anomaly and magnetotransport of disordered quantum wires

M. Czapkiewicz, P. Zagrajek, J. Wróbel, G. Grabecki, K. Fronc, T. Dietl, Y. Ohno, S. Matsuzaka, H. Ohno

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3 Citations (Scopus)

Abstract

The unexpected "0.7" plateau of conductance quantisation is usually observed for ballistic one-dimensional devices. In this work we study a quasi-ballistic quantum wire, for which the disorder-induced backscattering reduces the conductance quantisation steps. We find that the transmission probability resonances coexist with the anomalous plateau. The studies of these resonances as a function of the in-plane magnetic field and electron density point to the presence of spin polarisation at low carrier concentrations and constitute a method for the determination of the effective g-factor suitable for disordered quantum wires.

Original language	English
Article number	27003
Journal	EPL
Volume	82
Issue number	2
DOIs	https://doi.org/10.1209/0295-5075/82/27003
Publication status	Published - 2008 Apr 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Czapkiewicz, M.

AU - Zagrajek, P.

AU - Wróbel, J.

AU - Grabecki, G.

AU - Fronc, K.

AU - Dietl, T.

AU - Ohno, Y.

AU - Matsuzaka, S.

AU - Ohno, H.

PY - 2008/4/1

Y1 - 2008/4/1

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AB - The unexpected "0.7" plateau of conductance quantisation is usually observed for ballistic one-dimensional devices. In this work we study a quasi-ballistic quantum wire, for which the disorder-induced backscattering reduces the conductance quantisation steps. We find that the transmission probability resonances coexist with the anomalous plateau. The studies of these resonances as a function of the in-plane magnetic field and electron density point to the presence of spin polarisation at low carrier concentrations and constitute a method for the determination of the effective g-factor suitable for disordered quantum wires.

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0.7 anomaly and magnetotransport of disordered quantum wires

Abstract

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