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Schematic diagram showing the multi- and single-layer zigzag edge graphene coupling to two heat baths. The two end of the graphene is fixed and the other boundaries are free. The layers can be changed in multi-layer segment, and the right part is fixed as a single-layer. The total length of the GNRs is 5 nm.
(Color online) Heat current as a function of the temperature difference for armchair and zigzag edge asymmetric graphene nanoribbons. The inset is the temperature difference dependence of the thermal rectification factor. The average temperature T 0 = 320 K.
(Color online) Temperature dependence of the thermal conductivity in GNRs for opposite directions (R to L and L to R). The temperature difference ΔT = 20 K.
(Color online) Temperature dependence of thermal rectification factor for two temperature difference. T 0 = 320 K.
(Color online) Thickness ratio γ dependence of thermal rectification factor for two temperature differences 20 and 60 K, respectively. T0 = 320 K.
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