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arXiv · 2310.03523

Scanning gate microscopy of nonretracing electron-hole trajectories in a normal-superconductor junction

S. Maji·K. Sowa·M. P. Nowak
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Abstract

We theoretically study scanning gate microscopy (SGM) of electron and hole trajectories in a quantum point contact (QPC) embedded in a normal-superconductor (NS) junction. At zero voltage bias, the electrons and holes transported through the QPC form angular lobes and are subject to self-interference, which marks the SGM conductance maps with interference fringes analogously as in normal systems. We predict that for an NS junction at non-zero bias a beating pattern is to occur in the conductance probed with the use of the SGM technique owing to a mismatch of the Fermi wavevectors of electrons and holes. Moreover, the SGM technique exposes a pronounced disturbance in the angular conductance pattern, as the retroreflected hole does not retrace the electron path due to wavevector difference.

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S. Maji, K. Sowa, M. P. Nowak. 2023-10-05. Scanning gate microscopy of nonretracing electron-hole trajectories in a normal-superconductor junction. https://doi.org/10.1103/physrevb.109.115410

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