Parity induced edge-current saturation and current distribution in zigzag-edged graphene nano-ribbon devices
Parity induced edge-current saturation and current distribution in zigzag-edged graphene nano-ribbon devices
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DOI：
10.1007/s10825-011-0352-0
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发表时间：
2011-06
影响因子：
2.1
通讯作者：
S. Souma;M. Ogawa;Takahiro Yamamoto;Kazuyuki Watanabe
中科院分区：
文献类型：
--
作者：
S. Souma;M. Ogawa;Takahiro Yamamoto;Kazuyuki Watanabe
计算结果表明，尽管没有带隙，但宽度均匀的石墨烯纳米带（ZGNR）的电流-电压特性表现出显着的电流饱和行为。这种电流饱和行为的机制可以被理解为起源于ZGNR中边缘态对应的波函数的对称性。我们进一步证明，ZGNR的电流-电压特性可以急剧改变，即使通过一个单一的晶格空位的存在下，与强烈的依赖于空位的位置。通过分析通过这种系统的传输概率，可以直观地理解这种性质的起源。
We show computationally that the current-voltage characteristics of the zigzag-edged graphene nanoribbon (ZGNR) with the even width exhibit remarkable current saturation behavior in spite of the absence of the bandgap. Mechanism of such current-saturation behavior can be understood to be originated from the symmetries of the wavefunctions corresponding to the edge states in ZGNR. We further demonstrate that the current-voltage characteristics of ZGNR can be drastically changed even by the presence of a single lattice vacancy, with the strong dependence on the position of the vacancy. The origin of such properties is intuitively understood by analyzing the transmission probabilities through such systems.