we demonstrate a high-bandwidth graphene electro-optic modulator at 49 K The mobility of the graphene in these devices increases with decreasing temperature leading to reduced device resistance and be

In this study, we present a graphene electro-optic modulator with high bandwidth at a low temperature of 4.9 K. The mobility of graphene in these devices is found to increase at lower temperatures, resulting in reduced device resistance and improved RC-limited bandwidth of the graphene modulators.