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Enhanced magnetoresistance in graphene nanostructure modulated by effective exchange field and Fermi velocity
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10.1063/1.4804248
/content/aip/journal/jap/113/18/10.1063/1.4804248
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804248
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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 direction EEF and gate regions, respectively.

Image of FIG. 2.
FIG. 2.

(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 .

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

(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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/content/aip/journal/jap/113/18/10.1063/1.4804248
2013-05-09
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced magnetoresistance in graphene nanostructure modulated by effective exchange field and Fermi velocity
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4804248
10.1063/1.4804248
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