Gate-tunable current partition in graphene-based topological zero lines

Ke Wang, Yafei Ren, Xinzhou Deng, Shengyuan A. Yang, Jeil Jung, Zhenhua Qiao

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We demonstrate new mechanisms for gate-tunable current partition at topological zero-line intersections in a graphene-based current splitter. Based on numerical calculations of the nonequilibrium Green's functions and Landauer-Büttiker 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 zero-field 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 zero-line networks where finite orbital magnetic moments are expected when the current partition is asymmetric.

Original languageEnglish
Article number245420
JournalPhysical Review B
Volume95
Issue number24
DOIs
StatePublished - 19 Jun 2017

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