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arXiv 1301.2168cond-mat.str-elcond-mat.mes-hall
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近藤关联单分子器件的输运特性

Transport Characterization of Kondo-Correlated Single Molecule Devices

Gavin D. Scott, Douglas Natelson, Stefan Kirchner, Enrique Muñoz

摘要:

单分子断裂结器件作为探测多体近藤态的可调模型系统。这种状态的低能性质通常用Kondo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k_B*T_K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,这些偏差可以解决适当占背景,非近藤贡献的电导,往往被忽视。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。

英文摘要:

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, k_B*T_K. 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.

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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