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arXiv · 2101.05723

Local signatures of electron-electron scattering in an electronic cavity

Carolin Gold·Beat A. Bräm·Richard Steinacher·Tobias Krähenmann·Andrea Hofmann·Christian Reichl·Werner Wegscheider·Mansour Shayegan·Klaus Ensslin·Thomas Ihn
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Abstract

We image equilibrium and non-equilibrium transport through a two-dimensional electronic cavity using scanning gate microscopy (SGM). Injecting electrons into the cavity through a quantum point contact close to equilibrium, we raster-scan a weakly invasive tip above the cavity regions and measure the modulated conductance through the cavity. Varying the electron injection energy between $\pm$ 2 meV, we observe that conductance minima turn into maxima beyond the energy threshold of $\pm$ 0.6 meV. This observation bears similarity to previous measurements by Jura et al. [Jura et al., Phys. Rev. B 82, 155328 (2010)] who used a strongly invasive tip potential to study electron injection into an open two-dimensional electron gas. This resemblance suggests a similar microscopic origin based on electron-electron interactions.

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Carolin Gold, Beat A. Bräm, Richard Steinacher, Tobias Krähenmann, Andrea Hofmann, Christian Reichl, Werner Wegscheider, Mansour Shayegan, Klaus Ensslin, Thomas Ihn. 2021-01-14. Local signatures of electron-electron scattering in an electronic cavity. https://doi.org/10.1103/physrevresearch.3.013287

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