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Current-induced forces: a new mechanism to induce negative differential resistance and current-switching effect in molecular junctions

机译:电流感应力:在分子结中引起负差动电阻和电流切换效应的新机制

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Current-induced forces can excite molecules, polymers and other low-dimensional materials, which in turn leads to an effective gate voltage through Holstein interaction. Here, by taking a short asymmetric DNA junction as an example, and using the Langevin approach, we find that when suppression of charge transport by the effective gate voltage surpasses the current increase from an elevated voltage bias, the current-voltage (I-V) curves display strong negative differential resistance (NDR) and perfect current-switching characteristics. The asymmetric DNA chain differs in mechanical stability under inverse voltages and the I-V curve is asymmetric about inverse biases, which can be used to understand recent transport experiments on DNA chains, and meanwhile provides a new strategy to realize NDR in molecular junctions and other low-dimensional quantum systems.
机译:电流感应力可以激发分子,聚合物和其他低维材料,进而通过荷斯坦相互作用产生有效的栅极电压。在这里,以一个短的不对称DNA结为例,并使用Langevin方法,我们发现当有效栅极电压对电荷传输的抑制作用超过了电压升高引起的电流增加时,电流-电压(IV)曲线具有强大的负差分电阻(NDR)和完美的电流开关特性。不对称的DNA链在反向电压下的机械稳定性有所不同,IV曲线关于反向的偏压是不对称的,可以用来了解最近在DNA链上的转运实验,同时提供了一种新的策略来实现分子连接和其他低分子量反应中的NDR维量子系统。

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