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Ballistic electron transport has been studied in a device consisting of two quantum point contacts (QPC’s) in series, connected by a 1.5-µm-wide cavity. In the absence of a magnetic field the measured device resistance is approximately the sum of the (quantized) resistances of the individual QPC’s. In a magnetic field a gradual transition to the adiabatic transport regime is observed, which is reached at B ≈ 1.0 T. In this regime the device conductance is completely determined by the QPC with the lowest conductance. An explanation is given for the observed transition from Ohmic to adiabatic transport.

Transition from Ohmic to adiabatic transport in quantum point contacts in series