Effects induced by single and multiple dopants on the transport properties in zigzag-edged graphene nanoribbons
File Type:
PDFItem Type:
Journal ArticleDate:
2009Access:
OpenAccessCitation:
X. H. Zheng, I. Rungger, Z. Zeng, and S. Sanvito, Effects induced by single and multiple dopants on the transport properties in zigzag-edged graphene nanoribbons, Physics Review B, 80, 2009, 235426Download Item:
Abstract:
The effects of boron and nitrogen doping on the transport properties of zigzag-edged graphene nanoribbons
ZGNRs
with antiferromagnetically coupled edge states are investigated by first-principles electronic structure
combined with a nonequilibrium Green?s function technique. Specifically, the effects produced by single and
multiple impurities as a function of their distance from the edges are analyzed. It is found that the introduction
of single B or N atoms induces bound states and quasibound states in ZGNRs, which can be observed as dips
or peaks in the electron transmission function. In particular, the transmission channel associated to the edge
states is strongly suppressed when the impurities are close to the edges. Multiple impurities in general interfere
and modify further the transmission function. However, if the impurities are placed at positions such that the
associated bound and quasibound states appear at opposite sides of the Fermi level, then the transmission can
be rationalized as a simple superposition of the transmission function of individually doped ribbons. Finally, an
interesting situation appears for B and N codoping, since fully spin-polarized transmission peaks are generated
at energies corresponding to the ribbon gap. This offers the hope of using such nanoribbons for low-bias
spin-polarized tunneling in spintronics applications
Sponsor
Grant Number
National Natural Science Foundation of China (60703033).
10904148
National Natural Science Foundation of China (60703033).
0774148
Science Foundation Ireland (SFI)
07/IN.1/I945
Author's Homepage:
http://people.tcd.ie/sanvitosDescription:
PUBLISHED
Author: SANVITO, STEFANO; RUNGGER, IVAN
Type of material:
Journal ArticleCollections
Series/Report no:
Physics Review B80
Availability:
Full text availableKeywords:
PhysicsDOI:
http://dx.doi.org/10.1103/PhysRevB.80.235426Metadata
Show full item recordLicences: