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We report a precise experimental study on the shot noise of a quantum pointcontact (QPC) fabricated in a GaAs/AlGaAs based high-mobility two-dimensionalelectron gas (2DEG). The combination of unprecedented cleanliness and very highmeasurement accuracy has enabled us to discuss the Fano factor to characterizethe shot noise with a precision of 1 %. We observed that the shot noise at zeromagnetic field exhibits a slight enhancement exceeding the single particletheoretical prediction, and that it gradually decreases as a perpendicularmagnetic field is applied. We also confirmed that this additional noisecompletely vanishes in the quantum Hall regime. These phenomena can beexplained by the electron heating effect near the QPC, which is suppressed withincreasing magnetic field.

Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts