Transport properties of two finite armchair graphene nanoribbons.
Transport properties of two finite armchair graphene nanoribbons.
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DOI：
10.1186/1556-276x-8-1
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发表时间：
2013-01-02
影响因子：
--
通讯作者：
González JW
中科院分区：
文献类型：
--
作者：
Rosales L;González JW
在这项工作中，我们提出了一个理论研究的输运性质的两个有限的和平行的扶手椅型石墨烯纳米带连接到两个半无限的引线相同的材料。利用单能带紧束缚哈密顿量，基于真实的空间重整化技术中的绿色函数形式，我们计算了这些系统的态密度和电导，并考虑了几何约束和垂直于异质结构施加均匀磁场的影响.我们的研究结果表现出共振隧穿行为和周期性调制的传输特性作为所考虑的导体的几何形状的函数和作为跨异质结构的磁通量的函数。我们已经观察到Aharonov-Bohm类型的干扰表示的周期性金属-半导体的过渡的DOS和电导曲线的纳米结构。
In this work, we present a theoretical study of the transport properties of two finite and parallel armchair graphene nanoribbons connected to two semi-infinite leads of the same material. Using a single Π-band tight binding Hamiltonian and based on Green’s function formalisms within a real space renormalization techniques, we have calculated the density of states and the conductance of these systems considering the effects of the geometric confinement and the presence of a uniform magnetic field applied perpendicularly to the heterostructure. Our results exhibit a resonant tunneling behaviour and periodic modulations of the transport properties as a function of the geometry of the considered conductors and as a function of the magnetic flux that crosses the heterostructure. We have observed Aharonov-Bohm type of interference representing by periodic metal-semiconductor transitions in the DOS and conductance curves of the nanostructures.