0.7 anomaly and magnetotransport of disordered quantum wires
Czapkiewicz, M.; Zagrajek, P.; Wróbel, J.; Grabecki, G.; Fronc, K.; Dietl, T.; Ohno, Y.; Matsuzaka, S.; Ohno, H.; Czapkiewicz, M.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Zagrajek, P.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Wróbel, J.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Grabecki, G.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Fronc, K.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Dietl, T.; Instytut Fizyki Polskiej Akademii Nauk - al. Lotników 32/46, PL 02-668 Warszawa, Poland, EU; Instytut Fizyki Teoretycznej, Uniwersytet Warszawski - Hoża 69, PL 00-681 Warszawa, Poland, EU; ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency - 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan; Ohno, Y.; ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency - 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan; Matsuzaka, S.; ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency - 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan; Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University - Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan; Ohno, H.; ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency - 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan; Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University - Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
Журнал:
EPL (Europhysics Letters)
Дата:
2008-04-01
Аннотация:
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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