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arXiv 1611.01481cond-mat.mes-hall
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单分子器件中的输运海市蜃楼

Transport mirages in single-molecule devices

Rocco Gaudenzi, Maciej Misiorny, Enrique Burzurí, Maarten R. Wegewijs, Herre S. J. van der Zant

摘要:

分子系统可以表现出复杂的、化学上可定制的内部结构,其允许针对特定的机械、电子和光学性质。在单分子水平上,探索这些性质的两种主要互补方法是分子量子点结构和扫描探针。本文概述了与这两种方法相关的电子输运光谱的综合原理,并提出了一种新的高分辨率实验,对高自旋单分子结举例说明这些原则。这种光谱学在进一步推进我们对分子和原子系统的理解,特别是它们的自旋弛豫方面起着关键作用。在这个联合实验和理论分析中,特别关注共振区[单电子隧穿(SET)]和非共振区[非弹性电子(co)隧穿(IETS)]之间的交叉。我们表明,这两个过程的相互作用导致意外的海市蜃楼的共振没有单独捕获的两个图片。虽然这在能级位置和偏置电压的大部分可能机制中是重要的,但在分子输运研究中很少受到关注。结合非平衡IETS -四电子泵浦探测激发-这些海市蜃楼提供了关于自旋激发弛豫的关键信息。我们的涵盖物理图片是由一个主方程的方法,超越弱耦合的支持。目前的工作鼓励分子量子点和扫描探针光谱学领域之间更广泛的联系的发展。

英文摘要:

Molecular systems can exhibit a complex, chemically tailorable inner structure which allows for targeting of specific mechanical, electronic and optical properties. At the single-molecule level, two major complementary ways to explore these properties are molecular quantum-dot structures and scanning probes. This article outlines comprehensive principles of electron-transport spectroscopy relevant to both these approaches and presents a new, high-resolution experiment on a high-spin single-molecule junction exemplifying these principles. Such spectroscopy plays a key role in further advancing our understanding of molecular and atomic systems, in particular the relaxation of their spin. In this joint experimental and theoretical analysis, particular focus is put on the crossover between resonant regime [single-electron tunneling (SET)] and the off-resonant regime [inelastic electron (co)tunneling (IETS)]. We show that the interplay of these two processes leads to unexpected mirages of resonances not captured by either of the two pictures alone. Although this turns out to be important in a large fraction of the possible regimes of level positions and bias voltages, it has been given little attention in molecular transport studies. Combined with nonequilibrium IETS -- four-electron pump-probe excitations -- these mirages provide crucial information on the relaxation of spin excitations. Our encompassing physical picture is supported by a master-equation approach that goes beyond weak coupling. The present work encourages the development of a broader connection between the fields of molecular quantum-dot and scanning probe spectroscopy.

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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