Artículo de revista
Crafting zero-bias one-way transport of charge and spin
Fecha
2016Registro en:
Physical Review B 93, 075438 (2016)
2469-9950
DOI: 10.1103/PhysRevB.93.075438
Autor
Foa Torres, Luis
Dal Lago, V.
Suártez Morell, E.
Institución
Resumen
We explore the electronic structure and transport properties of a metal on top of a (weakly coupled) twodimensional
topological insulator. Unlike the widely studied junctions between topological nontrivial materials,
the systems studied here allow for a unique band structure and transport steering. First, states on the topological
insulator layer may coexist with the gapless bulk and, second, the edge states on one edge can be selectively
switched off, thereby leading to nearly perfect directional transport of charge and spin even in the zero bias limit.
We illustrate these phenomena for Bernal stacked bilayer graphene with Haldane or intrinsic spin-orbit terms
and a perpendicular bias voltage. This opens a path for realizing directed transport in materials such as van der
Waals heterostructures, monolayer, and ultrathin topological insulators.