Model of graphene nanostructure with effective exchange field. (a)denotes the homogeneous graphene nanostructure without periodic modulation, and (b) denotes the graphene superlattice with periodic gate and EEF modulations. and represent the length of single cell and the total length of system, respectively.
(a) and (b) Bulk states band structure with . (a) for the EEF case, , (b) for the RSOI case, the strength of RSOI . (c)and (d) Transmission spectrum with the total width , , and . (c) For the EEF case, (d) for the RSOI case.
Magnetoresistance [(a), (c), and (e)] and conductance [(b), (d), and (f)] as a function of the EEF strength and the RSOI strength . The energy used in the calculation . (a)–(d) correspond to the result of homogeneous graphene, and (e) and (f) correspond to the result of graphene superlattice of 10 periodic potential structures with . for [(a)–(d)] and for [(e) and (f)]. The effective conductance , here .
Fano factor as a function of the EEF strength . (a) corresponds to the result of homogeneous graphene, and (b)–(c) correspond to the result of graphene superlattice. for (a) and for (b) and (c). for (b) and for (c). The other parameters used are identical to those in Fig. 3.
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