A new and simple kind of all-carbon junction nanodevice, which is free of metal electrodes, is constructed by carbon chains seamlessly connected to two graphyne nanoribbons (GYNRs) electrodes. The electron transport properties of the constructed nanodevices are systematically investigated using self-consistent charge density-functional tight-binding combined with nonequilibrium Green’s function (NEGF) formalism. The effects of contact type and contact position on the electron transport properties of these devices are discussed. The calculated results show that the electron transport properties can be well modulated by the contact geometry of the carbon chain. In GYNRs connected by both horizontal and tilted single-carbon chain, an evident even–odd behavior of conductivity is observed. In addition, the linear, monotonous currents in a wide bias voltage range show good Ohmic contact. The negative differential resistance also appears under both positive and reverse bias voltages, indicating applications in bidirectional tunnel diodes. Comprehensive analyses of the physical mechanisms for the odd–even behavior are given. Remarkably, in GYNRs connected by double-carbon chains, a noticeable current stabilizer behavior occurs, suggesting that the graphyne nanodevices contacted with double-carbon chains can be used as a current stabilizer in circuits. This article provides valuable insight into all-carbon functional nanodevices.

中文翻译：

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有趣的奇偶效应、欧姆接触、负微分电阻和全碳石墨炔/碳链结中的电流稳定器行为

一种新型且简单的全碳结纳米器件，不含金属电极，由碳链无缝连接到两个石墨炔纳米带（GYNRs）电极构成。使用自洽电荷密度泛函紧束缚结合非平衡格林函数 (NEGF) 形式系统系统地研究了所构建纳米器件的电子传输特性。讨论了接触类型和接触位置对这些器件的电子传输特性的影响。计算结果表明，碳链的接触几何形状可以很好地调节电子传输特性。在由水平和倾斜单碳链连接的 GYNR 中，观察到明显的电导率奇偶行为。此外，线性，宽偏置电压范围内的单调电流表现出良好的欧姆接触。负差分电阻也出现在正偏压和反向偏压下，表明在双向隧道二极管中的应用。给出了奇偶行为的物理机制的综合分析。值得注意的是，在由双碳链连接的 GYNRs 中，发生了明显的电流稳定剂行为，表明与双碳链接触的石墨炔纳米器件可以用作电路中的电流稳定剂。本文提供了对全碳功能纳米器件的宝贵见解。给出了奇偶行为的物理机制的综合分析。值得注意的是，在由双碳链连接的 GYNRs 中，发生了明显的电流稳定剂行为，表明与双碳链接触的石墨炔纳米器件可以用作电路中的电流稳定剂。本文提供了对全碳功能纳米器件的宝贵见解。给出了奇偶行为的物理机制的综合分析。值得注意的是，在由双碳链连接的 GYNRs 中，发生了明显的电流稳定剂行为，表明与双碳链接触的石墨炔纳米器件可以用作电路中的电流稳定剂。本文提供了对全碳功能纳米器件的宝贵见解。