Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5019906
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Funding
- RFBR [16-32-00405 mol-a, 16-02-00579, 16-32-60130]
- [0306-2016-0015]
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The conductance of a GaAs-based suspended quantum point contact (QPC) equipped with lateral side gates has been experimentally studied in the absence of the external magnetic field. The half-integer conductance plateau (0.5 x 2e(2)/h) has been observed when an asymmetric voltage between the side gates is applied. The appearance of this plateau has been attributed to the spin degeneracy lifting caused by the spin-orbit coupling associated with the lateral electric field in the asymmetrically biased QPC. We have experimentally demonstrated that, despite the relatively small g-factor in GaAs, the observation of the spin polarization in the GaAs-based QPC became possible after the suspension due to the enhancement of the electron-electron interaction and the effect of the electric field guiding. These features are caused by a partial confinement of the electric field lines within a suspended semiconductor layer with a high dielectric constant. Published by AIP Publishing.
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