Electronic and transport properties of T-graphene nanoribbon: Symmetry-dependent multiple Dirac points, negative differential resistance and linear current-bias characteristics
Electronic and transport properties of T-graphene nanoribbon: Symmetry-dependent multiple Dirac points, negative differential resistance and linear current-bias characteristics
复制标题
T-石墨烯纳米带的电子和输运特性：对称性多狄拉克点、负微分电阻和线性电流偏置特性
DOI：
10.1209/0295-5075/107/37004
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发表时间：
2014-08-01
期刊：
影响因子：
1.8
通讯作者：
Guo, Y. D.
中科院分区：
文献类型：
--
作者：
Dai, C. J.;Yan, X. H.;Guo, Y. D.
基于紧束缚方法和密度泛函理论，研究了T型石墨烯纳米带的能带结构和输运性质。通过构造和求解紧束缚哈密顿量，得到了扶手椅型T型石墨烯纳米带中类Dirac费米子的线性色散关系和费米速度的解析表达式.多狄拉克点，这是触发扶手椅型T-石墨烯纳米带的镜像对称，观察到。我们的解析表达式可以很好地解释多重Dirac点的数目和位置。紧结合的结果证实了密度泛函计算的结果。此外，扶手椅型T-石墨烯纳米带表现出负微分电阻，而锯齿型T-石墨烯纳米带在费米能级附近具有线性电流-偏置电压特性。
Based on the tight-binding method and density functional theory, band structures and transport properties of T-graphene nanoribbons are investigated. By constructing and solving the tight-binding Hamiltonian, we derived the analytic expressions of the linear dispersion relation and Fermi velocity of Dirac-like fermions for armchair T-graphene nanoribbons. Multiple Dirac points, which are triggered by the mirror symmetry of armchair T-graphene nanoribbons, are observed. The number and positions of multiple Dirac points can be well explained by our analytic expressions. Tight-binding results are confirmed by the results from density functional calculations. Moreover, armchair T-graphene nanoribbons exhibit negative differential resistance, whereas zigzag T-graphene nanoribbons have linear current-bias voltage characteristics near the Fermi level.