Schematic of a velocity-modulated graphene nanostructure with EEF. (a) The graphene-based single-velocity barrier nanosturcture without periodic modulation. (b) The graphene-based periodic velocity barriers with gate and EEF modulations. The symbols ①, ②, and ③ denote source/drain, velocity barrier with y direction EEF and gate regions, respectively.
(a) and (c) Angular dependence of the transmission probabilities for and . (b) and (d) The phase diagrams in momentum space for two cases, and . (e) and (f) Transmission probabilities of electrons as a function of the FVR with the different incident angle and . The other parameters are , and .
Effective conductance and magnetoresistance of graphene-based single-velocity barrier nanostructure as a function of the EEF strength . Here . The other parameters used in the calculation are (a), (b) and (d), (c), (a)–(c) and (d).
(a)–(c) denote the effective conductance and magnetoresistance of graphene-based periodic velocity barriers nanosturcture ( ) as a function of the EEF strength with the different electrostatic potential (a) , (b) , and (c) , respectively. (d) Denotes the magnetoresistance of the graphene-based periodic velocity barrier as a function of the electrostatic potential with the EEF . The other parameters are , , and .
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