Shot noise suppression in InGaAs/InGaAsP quantum channels

Abstract

We have measured the shot noise in a quantum point contact (QPC) fabricated by using InGaAs/InGaAsP heterostructure, whose conductance can be electrically tuned by the gate voltages. The reduced shot noise is observed when the QPC conductance equals to N(2e^2/h) (N=4, 5, and 6), which is the direct experimental evidence of the coherent quantized channel formation in the QPC. The deviation of the observed Fano factor from the theory is explained by the electron heating effect generated at the QPC.

4 pages, 3 figures

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Cited by in corpus (5)

• Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown
• What Can We Learn from Noise? -- Mesoscopic Nonequilibrium Statistical Physics --
• Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts
• Conductance quantization and shot noise of a double-layer quantum point contact
• Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction