Transition from Ohmic to adiabatic transport in quantum point contacts in series
- 15 October 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (11) , 8083-8086
- https://doi.org/10.1103/physrevb.40.8083
Abstract
Ballistic electron transport has been studied in a device consisting of two quantum point contacts (QPC’s) in a 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.Keywords
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