A New Paradigm to Half-Metallicity in Graphene Nanoribbons
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- 作者：Jin Yu ; Wanlin Guo
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：March 21, 2013
- 年：2013
- 卷：4
- 期：6
- 页码：951-955
- 全文大小：354K
- 年卷期：v.4,no.6(March 21, 2013)
- ISSN：1948-7185
文摘
In contrast to the well-recognized transverse-electric-field-induced half-metallicity in zigzag graphene nanoribbons, here, we demonstrate by first-principles calculations that zigzag graphene nanoribbons sandwiched between hexagonal boron nitride nanoribbons or sheets can be tuned into half-metal simply by a bias voltage or a moderate compressive strain. The half-metallicity is attributed to an enhanced coupling effect of spontaneous polarization and asymmetrical exchange correlation along the ribbon width. The findings should open a viable route for efficient spin-resolved band engineering in graphene-based devices that are compatible with the current technology of the semiconductor industry.