  We study the electron transport through the graphene PNP junction under a
magnetic field and show that modes mixing plays an essential role. By using the
non-equilibrium Green's function method, the space distribution of the
scattering state for a specific incident modes as well the elements of the
transmission and reflection coefficient matrixes are investigated. All elements
of the transmission (reflection) coefficient matrixes are very different for a
perfect PNP junction, but they are same at a disordered junction due to the
mode mixing. The space distribution of the scattering state for the different
incident modes also exhibit the similar behaviors, that they distinctly differ
from each other in the perfect junction but are almost same in the disordered
junction. For a unipolar junction, when the mode number in the center region is
less than that in the left and right regions, the fluctuations of the total
transmission and reflection coefficients are zero, although each element has a
large fluctuation. These results clearly indicate the occurrence of perfect
mode mixing and it plays an essential role in a graphene PNP junction
transport.

Mesoscale and Nanoscale Physics