Volume 82, Number 2, April 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 April 2008|
0.7 anomaly and magnetotransport of disordered quantum wires
Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU
2 Instytut Fizyki Teoretycznej, Uniwersytet Warszawski - Hoża 69, PL 00-681 Warszawa, Poland, EU
3 ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency - 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan
4 Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University - Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
Corresponding author: firstname.lastname@example.org
Accepted: 27 February 2008
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.
PACS: 73.63.Nm – Quantum wires / 73.23.Ad – Ballistic transport / 72.25.Dc – Spin polarised transport in semiconductors
© EPLA, 2008
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