Direct imaging of coherent quantum transport in graphene p−n−p junctions
Physical Review B
American Physical Society
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Herbschleb, E., Puddy, R., Marconcini, P., Griffiths, J., Jones, G., Macucci, M., Smith, C., & et al. (2015). Direct imaging of coherent quantum transport in graphene p−n−p junctions. Physical Review B, 92 (125414)https://doi.org/10.1103/PhysRevB.92.125414
We use electrostatic lithography to fabricate a graphene p-n-p junction and exploit the coherence of weakly confined Dirac quasiparticles to image the underlying scattering potential using low-temperature scanning gate microscopy. The tip-induced perturbation to the junction potential modifies the condition for resonant scattering, enabling us to detect localized Fabry-Pérot subcavities from the focal point of halos in scanning gate images. In addition to halos over the bulk, we also observe ones spatially registered to the physical edge of the graphene. Guided by quantum transport simulations, we attribute these to modified resonant scattering at the edges within elongated cavities that form due to focusing of the electrostatic field.
We would like to acknowledge support from EPSRC.
External DOI: https://doi.org/10.1103/PhysRevB.92.125414
This record's URL: https://www.repository.cam.ac.uk/handle/1810/249210
Attribution-NonCommercial 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
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