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• W2995101524 abstract "We compare classical versus quantum electron transport in recently investigated magnetic focusing devices (Bhandari et al 2016 Nano Lett. 16 1690) exposed to the perturbing potential of a scanning gate microscope (SGM). Using the Landauer-Büttiker formalism for a multi-terminal device, we calculate resistance maps that are obtained as the SGM tip is scanned over the sample. There are three unique regimes in which the scanning tip can operate (focusing, repelling, and mixed regime) which are investigated. Tip interacts mostly with electrons with cyclotron trajectories passing directly underneath it, leaving a trail of modified current density behind it. Other (indirect) trajectories become relevant when the tip is placed near the edges of the sample, and current is scattered between the tip and the edge. We point out that, in contrast to SGM experiments on gapped semiconductors, the STM tip can induce a pn junction in graphene, which improves contrast and resolution in SGM. We also discuss possible explanations for spatial asymmetry of experimentally measured resistance maps, and connect it with specific configurations of the measuring probes." @default.
• W2995101524 created "2019-12-26" @default.
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• W2995101524 date "2017-04-10" @default.
• W2995101524 modified "2023-10-02" @default.
• W2995101524 title "Scanning gate microscopy of magnetic focusing in graphene devices: quantum versus classical simulation" @default.
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• W2995101524 doi "https://doi.org/10.1088/1361-6528/aa677a" @default.
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