Gate tunable current partition in graphene based topological zero lines
Abstract
We demonstrate new mechanisms for gate tunable current partition at topological zeroline intersections in a graphenebased current splitter. Based on numerical calculations of the nonequilibrium Green's functions and LandauerBüttiker formula, we show that the presence of a perpendicular magnetic field on the order of a few Teslas allows for carrier sign dependent current routing. In the zerofield limit the control on current routing and partition can be achieved within a range of $10\%$$90\%$ of the total incoming current by tuning the carrier density at tilted intersections, or by modifying the relative magnitude of the bulk band gaps via gate voltage. We discuss the implications of our findings in the design of topological zeroline networks where finite orbital magnetic moments are expected when the current partition is asymmetric.
 Publication:

arXiv eprints
 Pub Date:
 January 2017
 arXiv:
 arXiv:1702.00089
 Bibcode:
 2017arXiv170200089R
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 14 pages, 4 figures