TY - JOUR
T1 - 0.7 anomaly and magnetotransport of disordered quantum wires
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
N2 - 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.
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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U2 - 10.1209/0295-5075/82/27003
DO - 10.1209/0295-5075/82/27003
M3 - Article
AN - SCOPUS:79051470158
SN - 0295-5075
VL - 82
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
IS - 2
M1 - 27003
ER -