Conductance quantization at a half-integer plateau in a symmetric GaAs quantum wire |
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Authors: | Crook R Prance J Thomas K J Chorley S J Farrer I Ritchie D A Pepper M Smith C G |
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Institution: | Cavendish Laboratory, 19 JJ Thomson Avenue, Cambridge CB3 0HE, UK. rc230@cam.ac.uk |
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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(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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