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We report the observation of an anomalous conductance plateau near G = 0.5 G0(G0 = 2e2/h) in asymmetrically biased AlGaAs/GaAs quantum point contacts(QPCs), with in-plane side gates in the presence of lateral spin-orbitcoupling. This is a signature of spin polarization in the narrow portion of theQPC. The appearance and evolution of the conductance anomaly has been studiedat T=4.2K as a function of the potential asymmetry between the side gates. Theobservation of spontaneous spin polarization in a side-gated GaAs QPC couldeventually lead to the realization of an all-electric spin-valve at tens ofdegrees Kelvin.

Spin Polarization in a AlGaAs/GaAs Quantum Point Contact with in-plane side gates