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arXiv 1806.00124cond-mat.mes-hall
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门控量子干涉:单分子电荷输运中反共振的直接观测

Gate controlled quantum interference: direct observation of anti-resonances in single molecule charge transport

Yueqi Li, Marius Buerkle, Guangfeng Li, Ali Rostamian, Hui Wang, Zixiao Wang, David R. Bowler, Tsuyoshi Miyazaki, Yoshihiro Asai, Gang Zhou, Nongjian Tao

摘要:

量子干涉可以深刻地影响单个分子中的电荷输运,但实验通常只能测量费米能量下的电导。因为一般来说,量子干涉的最显著的特征并不位于费米能量处,所以非常希望在更宽的能量范围内探测电荷输运。在这里,我们通过电化学门控的方法,测量电导和映射的传输函数的单分子在费米能量和周围,并研究与建设性和相消干涉的签名。利用电化学门控技术,调节最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)之间的量子干涉,直接观察到反共振,这是相消干涉的一个显著特征.通过调节分子进入和退出反共振,我们实现了电导的连续控制超过2个数量级,亚阈值摆幅为~17 mV/dec,这与高速和低功率电子学相关。

英文摘要:

Quantum interference can profoundly affect charge transport in single molecules, but experiments can usually measure only the conductance at the Fermi energy. Because in general the most pronounced features of the quantum interference are not located at the Fermi energy, it is highly desirable to probe charge transport in a broader energy range. Here by the method of electrochemical gating, we measure the conductance and map the transmission functions of single molecules at and around the Fermi energy, and study signatures associated with constructive and destructive interference. With the electrochemical gate control, we tune the quantum interference between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), and directly observe anti-resonance, a distinct feature of destructive interference. By tuning the molecule in and out of anti-resonance, we achieve continuous control of the conductance over 2 orders of magnitude with a subthreshold swing of ~17 mV/dec, features relevant to high-speed and low-power electronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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