石墨烯kirigami作为可拉伸和可调量子点阵列的平台
Graphene kirigami as a platform for stretchable and tunable quantum dot arrays
摘要：
量子输运性质的石墨烯kirigami在最近的实验中研究的类似的弹性，可逆变形的制度计算。我们的研究结果表明，在低电子密度下，这种结构的电导分布复制的耦合量子点系统，其特征在于由一系列的迷你带和阻隙。电导和I-V曲线在表征这些结构伸长的弹性形变的不同阶段具有不同的特征。值得注意的是，局域态之间的有效耦合在小的伸长阶段强烈减少，而在大的伸长制度的发展，强大的，本地化的伪磁场的障碍，可以加强耦合和重建共振隧穿跨越kirigami。这提供了一个有趣的例子之间的相互作用的几何形状和伪磁场引起的限制。在传输中交替的能带和阻隙导致在明确定义的能量/掺杂范围内具有负微分电导的I-V特性。这些效应在包括边缘粗糙度和库仑相互作用的现实场景中应该是稳定的，因为预计这些将进一步促进石墨烯纳米结构的窄段中的低能量下的状态的局部化。
英文摘要：
The quantum transport properties of a graphene kirigami similar to those studied in recent experiments are calculated in the regime of elastic, reversible deformations. Our results show that, at low electronic densities, the conductance profile of such structures replicates that of a system of coupled quantum dots, characterized by a sequence of minibands and stop-gaps. The conductance and I-V curves have different characteristics in the distinct stages of elastic deformation that characterize the elongation of these structures. Notably, the effective coupling between localized states is strongly reduced in the small elongation stage, whereas in the large elongation regime the development of strong, localized pseudomagnetic field barriers can reinforce the coupling and reestablish resonant tunneling across the kirigami. This provides an interesting example of interplay between geometry and pseudomagnetic field-induced confinement. The alternating miniband and stop-gaps in the transmission lead to I-V characteristics with negative differential conductance in well defined energy/doping ranges. These effects should be stable in a realistic scenario that includes edge roughness and Coulomb interactions, as these are expected to further promote localization of states at low energies in narrow segments of graphene nanostructures.
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