论文标题
跨石墨烯纳米容器中的量子点的电子传输：朝向内置间隙 - 可触发金属 - 触发器 - 金属杂音
Electronic transport across quantum dots in graphene nanoribbons: Toward built-in gap-tunable metal-semiconductor-metal heterojunctions
论文作者
论文摘要
全格膦烯电子产品的成功受到了挑战性的实现和随后整合半导体通道和金属接触的影响。在这里，我们全面研究了跨宽度调节的异质结构的电子传输，这些异质界面由嵌入一对扶手椅边缘的金属纳米骨中的不同长度和宽度的石墨烯量子点组成，这些金属纳米骨嵌入了最近通过地面合成的扶手椅金属纳米骨。我们表明，量子点的存在可以使宽度依赖性的传输差距打开，从而产生内置的一维金属 - 触发器 - 金属连接。此外，我们发现，在频带边缘附近，电导在增加通道长度后的平滑过渡到从反弹药向往到谐振转运方案的平稳过渡。这些结果是根据量子填充效应与量子点到铅耦合之间的竞争而合理化的。总体而言，我们的工作将石墨烯量子点纳米结构建立为吸引人的平台，以无缝将间隙 - 可调的半导体通道和金属触点整合到单独的纳米替体中，因此实现了独立的碳基电子设备。
The success of all-graphene electronics is severely hindered by the challenging realization and subsequent integration of semiconducting channels and metallic contacts. Here, we comprehensively investigate the electronic transport across width-modulated heterojunctions consisting of a graphene quantum dot of varying lengths and widths embedded in a pair of armchair-edged metallic nanoribbons, of the kind recently fabricated via on-surface synthesis. We show that the presence of the quantum dot enables the opening of a width-dependent transport gap, thereby yielding built-in one-dimensional metal-semiconductor-metal junctions. Furthermore, we find that, in the vicinity of the band edges, the conductance is subject to a smooth transition from an antiresonant to a resonant transport regime upon increasing the channel length. These results are rationalized in terms of a competition between quantum-confinement effects and quantum dot-to-lead coupling. Overall, our work establishes graphene quantum dot nanoarchitectures as appealing platforms to seamlessly integrate gap-tunable semiconducting channels and metallic contacts into an individual nanoribbon, hence realizing self-contained carbon-based electronic devices.
