Shot noise in magnetic field modulated graphene superlattice

• We investigate the shot noise properties through graphene superlattice.
• The Fano factor depends on the number of barriers.
• For the parallel configuration the Fano factor reaches a Poissonian value.
• For the antiparallel configuration the Fano factor at the Dirac point equals 1/3.

We investigate the shot noise properties in a monolayer graphene superlattice modulated by N parallel ferromagnets deposited on a dielectric layer. It is found that for the antiparallel magnetization configuration or when magnetic field is zero the new Dirac-like point appears in graphene superlattice. The transport is almost forbidden at this new Dirac-like point, and the Fano factor reaches its maximum value 1/3. In the parallel magnetization configuration as the number of magnetic barriers increases, the shot noise increases. In this case, the transmission can be blocked by the magnetic–electric barrier and the Fano factor approaches 1, which is dramatically distinguishable from that in antiparallel alignment. The results may be helpful to control the electron transport in graphene-based electronic devices.

In the parallel magnetization configuration when the number of the barriers is large enough unlike antiparallel magnetization configuration the Fano factor reaches a Poissonian value for any barrier height.Figure optionsDownload as PowerPoint slide