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-B¨uttiker 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.
|Titolo:||Scaling approach to tight-binding transport in realistic graphene devices: The case of transverse magnetic focusing|
|Editore:||American Physical Society|
|Data di pubblicazione:||15-set-2016|
|Parole chiave (inglese):||graphene|
Landauer-Büttiker scattering theory
transverse magnetic focusing (TMF)
|Appare nelle tipologie:||1.1 Articolo in rivista|