  In this work using non-equilibrium molecular dynamics simulation we implement
a series of simulation under positive and negative temperature gradient in
order to investigate the thermal rectification in the graphene C3B junction
GCB. The dependence of thermal rectification on temperature difference between
the hot and the cold baths is obtained. The important quantity that we present
here is the inplanes and out of plane phonon modes contribution in the thermal
rectification. We see that the Y mode has high and positive thermal
rectification while that the X and Z modes have small and negative thermal
rectifications. Thermal rectification for Y mode increases sharply beyond T 30
K to 150 but for X and Z modes decrease slowly by increasing T Our results show
that Y mode has major role in the thermal rectification Moreover the underlying
mechanisms that leads to the thermal rectification and also Kapitza resistance
at the interface are studied via the phonon density of states DOS
