Abstract
We investigate the magnetic ordering in zigzag edged graphene nanoribbons under cross-ribbon electric fields by using the Hubbard model within the unrestricted Hatree-Fock approximation. In the absence of applied electric field, the ground state is an "edge-magnetized state" with magnetic moments mainly localized on the edges, where the moments on the two edges are mutually antiparallel. Under electric fields, we find that the band gap near the Fermi level becomes spin dependent. On increasing the strength of the electric field, the biased charge distribution decreases or increases the band gap with respect to the majority spin on each edge. Increasing the strength further, the system becomes half-metalic, and finally the magnetization completely disappears.
| Original language | English |
|---|---|
| Article number | 062015 |
| Journal | Journal of Physics: Conference Series |
| Volume | 200 |
| Issue number | SECTION 6 |
| DOIs | |
| Publication status | Published - 2010 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Electric field effects in zigzag edged graphene nanoribbons. / Nomura, Takao; Yamamoto, Daisuke; Kurihara, Susumu.
In: Journal of Physics: Conference Series, Vol. 200, No. SECTION 6, 062015, 2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electric field effects in zigzag edged graphene nanoribbons
AU - Nomura, Takao
AU - Yamamoto, Daisuke
AU - Kurihara, Susumu
PY - 2010
Y1 - 2010
N2 - We investigate the magnetic ordering in zigzag edged graphene nanoribbons under cross-ribbon electric fields by using the Hubbard model within the unrestricted Hatree-Fock approximation. In the absence of applied electric field, the ground state is an "edge-magnetized state" with magnetic moments mainly localized on the edges, where the moments on the two edges are mutually antiparallel. Under electric fields, we find that the band gap near the Fermi level becomes spin dependent. On increasing the strength of the electric field, the biased charge distribution decreases or increases the band gap with respect to the majority spin on each edge. Increasing the strength further, the system becomes half-metalic, and finally the magnetization completely disappears.
AB - We investigate the magnetic ordering in zigzag edged graphene nanoribbons under cross-ribbon electric fields by using the Hubbard model within the unrestricted Hatree-Fock approximation. In the absence of applied electric field, the ground state is an "edge-magnetized state" with magnetic moments mainly localized on the edges, where the moments on the two edges are mutually antiparallel. Under electric fields, we find that the band gap near the Fermi level becomes spin dependent. On increasing the strength of the electric field, the biased charge distribution decreases or increases the band gap with respect to the majority spin on each edge. Increasing the strength further, the system becomes half-metalic, and finally the magnetization completely disappears.
UR - http://www.scopus.com/inward/record.url?scp=77957086531&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957086531&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/200/6/062015
DO - 10.1088/1742-6596/200/6/062015
M3 - Article
AN - SCOPUS:77957086531
VL - 200
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - SECTION 6
M1 - 062015
ER -