Tuning the magnetic and electronic properties of bilayer graphene nanoribbons on Si(001) by bias voltage

Zhuhua Zhang, Changfeng Chen, Xiao Cheng Zeng, Wanlin Guo

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report on a systematic study of bias-voltage-induced modulation of magnetic and electronic properties of bilayer zigzag graphene nanoribbons (Z-GNRs) on Si(001) substrate by first-principles calculations. We show that the intrinsically nonmagnetic bilayer Z-GNRs exhibit magnetic ordering on the top layer while the bottom layer serves as a nonmagnetic buffer layer when adsorbed on the substrate. Interestingly, the adsorbed bilayers display distinct ribbon-width-dependent magnetoelectric effect under bias voltages. The magnetoelectric coefficient oscillates with increasing ribbon width, which arises from an interesting interplay of the interaction of the bottom ribbon layer with the substrates and the decay length of the localized edge states in Z-GNRs. Moreover, our calculations reveal that the electronic band gap of the top ribbon layer also can be effectively modulated by the applied bias voltage, which can lead to a semiconductor-to-metal transition in the top magnetic semiconductor layer. These results provide insights into the intriguing behaviors of Z-GNRs on substrates and raise the prospects of developing an innovative path toward graphene-based electronic and spintronic devices by integrating the emerging nanoscale graphene systems with existing silicon technology.

Original languageEnglish (US)
Article number155428
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number15
DOIs
StatePublished - Apr 13 2010

Fingerprint

Nanoribbons
Carbon Nanotubes
Graphite
Bias voltage
Electronic properties
Graphene
Magnetic properties
graphene
Tuning
tuning
magnetic properties
ribbons
electric potential
electronics
Substrates
Magnetoelectric effects
Magnetic semiconductors
Magnetoelectronics
Silicon
Buffer layers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Tuning the magnetic and electronic properties of bilayer graphene nanoribbons on Si(001) by bias voltage. / Zhang, Zhuhua; Chen, Changfeng; Zeng, Xiao Cheng; Guo, Wanlin.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 15, 155428, 13.04.2010.

Research output: Contribution to journalArticle

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