Beconcini, M. and Valentini, S. and Krishna Kumar, Roshan and Auton, G. H. and Geim, A. K. and Ponomarenko, Leonid Alexandrovich and Polini, Marco and Taddei, F. (2016) Scaling approach to tight-binding transport in realistic graphene devices : the case of transverse magnetic focusing. Physical review B, 94 (11): 115441. ISSN 1098-0121
1605.06924v1.pdf - Accepted Version
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Abstract
Ultraclean graphene sheets encapsulated between hexagonal boron nitride crystals host two-dimensional electron systems in which low-temperature transport is solely limited by the sample size. We revisit the theoretical problem of carrying out microscopic calculations of nonlocal ballistic transport in such micron-scale devices. By employing the Landauer-Büttiker scattering theory, we propose a scaling approach to tight-binding nonlocal transport in realistic graphene devices. We test our numerical method against experimental data on transverse magnetic focusing (TMF), a textbook example of nonlocal ballistic transport in the presence of a transverse magnetic field. This comparison enables a clear physical interpretation of all the observed features of the TMF signal, including its oscillating sign.