How to distinguish between interacting and noninteracting molecules in tunnel junctions†,Nanoscale

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How to distinguish between interacting and noninteracting molecules in tunnel junctions†
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1039/c7nr05739c
Miguel A. Sierra _{1,

2,

3} , David Sánchez _{1,

2,

3} , Alvar R. Garrigues _{4,

5,

6,

7} , Enrique del Barco _{4,

5,

6,

7} , Lejia Wang _{8,

9,

10,

11,

12} , Christian A. Nijhuis _{12,

13,

13,

14,

15}

Affiliation

Recent experiments demonstrate a temperature control of the electric conduction through a ferrocene-based molecular junction. Here we examine the results in view of determining means to distinguish between transport through single-particle molecular levels or via transport channels split by Coulomb repulsion. Both transport mechanisms are similar in molecular junctions given the similarities between molecular intralevel energies and the charging energy. We propose an experimentally testable way to identify the main transport process. By applying a magnetic field to the molecule, we observe that an interacting theory predicts a shift of the conductance resonances of the molecule whereas in the noninteracting case each resonance is split into two peaks. The interaction model works well in explaining our experimental results obtained in a ferrocene-based single-molecule junction, where the charge degeneracy peaks shift (but do not split) under the action of an applied 7-Tesla magnetic field. This method is useful for a proper characterization of the transport properties of molecular tunnel junctions.

中文翻译：

如何区分隧道结中的相互作用分子和非相互作用分子†

最近的实验证明了通过二茂铁基分子结对导电的温度控制。在这里，我们检查结果的目的是确定通过单分子水平或通过分子运输来区分运输的方法。输运渠道因库仑排斥而分裂。鉴于分子内能级和充电能之间的相似性，两种传输机理在分子结中都相似。我们提出了一种实验可测试的方法来识别主要运输过程。通过对分子施加磁场，我们观察到相互作用的理论预测了分子电导共振的移动，而在非相互作用的情况下，每个共振都被分为两个峰。相互作用模型很好地解释了我们在基于二茂铁的单分子结中获得的实验结果，在该结中，电荷简并峰在施加的7-Tesla磁场作用下发生位移（但不会分裂）。此方法对于正确表征分子隧道结的传输特性很有用。

更新日期：2018-01-25

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