Reverse strain-induced snake states in graphene nanoribbons

Strain can tailor the band structures and properties of graphene nanoribbons (GNRs) with well-known emergent pseudo-magnetic fields corresponding pseudo-Landau levels (pLLs). We design one type zigzag GNR (ZGNR) reverse strains, producing opposite signs in lower upper half planes. Therefore, electrons propagate along interface as "snake states", experiencing Lorentz forces they cross zero field border line. By using Landauer-Buttiker formalism combined nonequilibrium Green's function method, existence robustness strain-induced snake states are further studied. Furthermore, realization long-thought pure valley currents monolayer systems is also proposed our device.