Scattering of topological kink-antikink states in bilayer graphene structures

Autor:	Benchtaber, Nassima, Sánchez, David, Serra, Llorenç
Rok vydání:	2021
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. B 104, 155303 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.104.155303
Popis:	Gapped bilayer graphene can support the presence of intragap states due to kink gate potentials applied to the graphene layers. Electrons in these states display valley-momentum locking, which makes them attractive for topological valleytronics. Here, we show that kink-antikink local potentials enable modulated scattering of topological currents. We find that the kink-antikink coupling leads to anomalous steps in the junction conductance. Further, when the constriction detaches from the propagating modes, forming a loop, the conductance reveals the system energy spectrum. Remarkably, these kink-antikink devices can also work as valley filters with tiny magnetic fields by tuning a central gate. Comment: 10 pages, 10 figures, v3, published version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2103.13323 Zobrazit plný text záznamu View this record from Arxiv