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Conductance quantization at a half-integer plateau in a symmetric GaAs quantum wire

Crook, R. and Prance, J. and Thomas, K. J. and Chorley, S. J. and Farrer, I. and Ritchie, D. A. and Pepper, M. and Smith, C. G. (2006) Conductance quantization at a half-integer plateau in a symmetric GaAs quantum wire. Science, 312 (5778). pp. 1359-1362. ISSN 0036-8075

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Abstract

We present data from an induced gallium arsenide ( GaAs) quantum wire that exhibits an additional conductance plateau at 0.5(2e(2)/h), where e is the charge of an electron and h is Planck's constant, in zero magnetic field. The plateau was most pronounced when the potential landscape was tuned to be symmetric by using low-temperature scanning-probe techniques. Source-drain energy spectroscopy and temperature response support the hypothesis that the origin of the plateau is the spontaneous spin-polarization of the transport electrons: a ferromagnetic phase. Such devices may have applications in the field of spintronics to either generate or detect a spin-polarized current without the complications associated with external magnetic fields or magnetic materials.

Item Type: Article
Journal or Publication Title: Science
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 59557
Deposited By: ep_importer_pure
Deposited On: 04 Nov 2012 15:00
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59557

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