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(Color online) (a) Band profile along the transport direction of graphene p–n junctions and (b) schematic of a simple AGNR one. The junctions are characterized by two important parameters, the potential barrier U 0 andthe transition length L. (c) Other hetero-structures under study, namely, T-and AZ-junctions. MC , D is the number of carbon chains between two ribbon edges in the two junction sides and in the center, respectively.
(Color online) I-V characteristics (a) of the simple junction with different L and (b) of the T-junctions with different indexes MD . The insets show the current plotted on the logarithm scale in (a) and the L-dependence of PVR in (b). Other parameters: U 0 = 0.7 eV, MC = 21, and L = 10.2 nm in (b), and the device length .
(Color online) Local density of states of (a) simple (MC = MD = 21) and (b) T-junctions (MC = 21 and MD = 29). (c) shows the corresponding transmission probability as a function of energy. The structures are unbiased.
(Color online) I-V characteristics of (a) the simple junction and (b)the T-one with different edge disorder configurations. Other parameters: U 0 = 0.7 eV, MC = 21, MD = 29, L = 5.1 nm, and .
(Color online) L-dependence of the PVR in the AZ-junction for different numbers MZ of zigzag lines without and with (averaged over ten configurations of) the edge disorder. Others parameters: U 0 = 0.7 eV and .
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