Transport characterization of Kondo-correlated single-molecule devices
Transport characterization of Kondo-correlated single-molecule devices
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DOI：
10.1103/physrevb.87.241104
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发表时间：
2013-01
影响因子：
3.7
通讯作者：
G. Scott;D. Natelson;S. Kirchner;E. Muñoz
中科院分区：
文献类型：
--
作者：
G. Scott;D. Natelson;S. Kirchner;E. Muñoz
单分子断裂结器件作为探测多体近藤态的可调模型系统。这种状态的低能量特性通常用近藤模型来描述，其中系统对不同扰动的响应由单个涌现能量标度kBTK表征。不同实验系统之间的比较显示出数值一致性的问题。与一个新的约束分析检查电导对温度，偏压和磁场的依赖性，同时，我们表明，这些偏差可以通过适当占背景，非近藤贡献的电导，往往被忽视的解决。我们清楚地证明了这些非近藤传导通道的重要性，通过检查运输设备的总电导超过理论最大值，由于近藤辅助隧道。
A single-molecule break junction device serves as a tunable model system for probing the many-body Kondo state. The low-energy properties of this state are commonly described in terms of a Kondo model, where the response of the system to different perturbations is characterized by a single emergent energy scale, kBTK . Comparisons between different experimental systems have shown issues with numerical consistency. With a new constrained analysis examining the dependence of conductance on temperature, bias, and magnetic field simultaneously, we show that these deviations can be resolved by properly accounting for background, non-Kondo contributions to the conductance that are often neglected. We clearly demonstrate the importance of these non-Kondo conduction channels by examining transport in devices with total conductances exceeding the theoretical maximum due to Kondo-assisted tunneling alone.