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We report a zero-bias peak in the differential conductance of a Quantum PointContact (QPC), which splits in an external magnetic field. The peak is observedover a range of device conductance values starting significantly below$2e^2/h$. The observed splitting closely matches the Zeeman energy and showsvery little dependence on gate voltage, suggesting that the mechanismresponsible for the formation of the peak involves electron spin. PrecisionZeeman energy data for the experiment are obtained from a separately patternedsingle-electron transistor located a short distance away from the QPC. The QPCdevice has four gates arranged in a way that permits tuning of the longitudinalpotential, and is fabricated in a GaAs/AlGaAs heterostructure containing2-dimenional electron gas. We show that the agreement between the peaksplitting and the Zeeman energy is robust with respect to moderate distortionsof the QPC potential. We also show that the mechanism that leads to theformation of the ZBP is different from the conventional Kondo effect found inquantum dots.

Magnetic Splitting of the Zero Bias Peak in a Quantum Point Contact with a Variable Aspect Ratio