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Onset of Spin-Incoherent Transport in a Quantum Wire

Hew, WK; Thomas, KJ; Pepper, M; Farrer, I; Anderson, D; Jones, GAC; Ritchie, DA; (2009) Onset of Spin-Incoherent Transport in a Quantum Wire. In: Caldas, MJ and Studart, N, (eds.) PHYSICS OF SEMICONDUCTORS. (pp. 343 - 344). AMER INST PHYSICS

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We present transport measurements of a weakly-confined quantum wire showing evidence of spin-incoherent transport at low carrier densities. In this transport regime, spin modes are generally reflected, suppressing the conductance of the channel by a factor of two. We observe precisely such a suppression when we operate our quantum wire in a regime of weak confinement. A conductance plateau appears at e(2)/h in zero magnetic field, accompanied by a gradual suppression of the first quantised plateau at 2e(2)/h as the carrier density is decreased. When an in-plane magnetic field is applied, this plateau weakens with fields up to 9 T, beyond which it strengthens as the field is further increased, suggestive of a spin incoherent-to-coherent transition.

Type:Proceedings paper
Title:Onset of Spin-Incoherent Transport in a Quantum Wire
Event:29th International Conference on Physics of Semiconductors
Location:Rio de Janeiro, BRAZIL
Dates:2008-07-27 - 2008-08-01
Keywords:quantum wire, spin-incoherent Luttinger liquid, GAS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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