Figure 2

SAW-driven single-electron transport through a tunnel-coupled wire (TCW). (a) Schematic showing an interdigital transducer launching a surface acoustic wave (SAW) towards the circuit consisting of a pair of tunnel-coupled transport paths whose ends are equipped with QDs to send and catch a single electron. (b) Scanning electron micrograph of the source quantum dot (QD) with schematic indications of the QPC sensor and the pulsing gate. (c) Measurement of the single-shot transfer probability P as function of potential detuning Δ. The solid line shows the result of a simplistic one-dimensional simulation assuming charge excitation in the TCW. (d) Schematic showing vertical potential cuts in the tunnel-coupled wire (TCW) for different potential detuning Δ. (e) Time-dependent simulation of SAW-driven electron propagation through the tunnel-coupled wire (TCW) at \(\Delta =0\) for peak-to-peak SAW modulation amplitudes of \(A={17}{\text{ meV}}\) and \(A={45}{\text{ meV}}\). The grey regions indicate the surface gates. The data shows the evolution of the single-electron wave function ψ for different time frames t indicated via the vertical dashed lines. Adapted from Ref. [31]