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  • Title: Conductance quantization at a half-integer plateau in a symmetric GaAs quantum wire.
    Author: Crook R, Prance J, Thomas KJ, Chorley SJ, Farrer I, Ritchie DA, Pepper M, Smith CG.
    Journal: Science; 2006 Jun 02; 312(5778):1359-62. PubMed ID: 16741116.
    Abstract:
    We present data from an induced gallium arsenide (GaAs) quantum wire that exhibits an additional conductance plateau at 0.5(2e2/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.
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