Electron Scattering Experiments in Mesoscopic Conductors
We have developed an experimental approach to direct evaluation of the entire transmission matrix of a mesoscopic conductor. This enables new investigations, previously not possible using standard transport measurements. Two initial applications are presented. In the first, we study perturbations to transport in small conductors caused by the measurement probes themselves. Comparing measurements in the complementary limits of weak and strong probe coupling, we elucidate mechanisms underlying transport anomalies observed in ballistic junctions. In the second, we employ a collinear pair of quantum point contacts to “image” the distribution function of electrons emerging from one constriction in the quantized regime. Modal structure observed in this outgoing electron “beam” provides new insights into details of the conductance quantization phenomenon and provides direct experimental evidence for non-adiabatic transport.
KeywordsCritical Path Transmission Matrix Quantum Point Contact Side Probe Main Conductor
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