Universal Temperature Crossover Behavior of Electrical Conductance in a Single Oligothiophene Molecular Wire
Universal Temperature Crossover Behavior of Electrical Conductance in a Single Oligothiophene Molecular Wire
复制标题
DOI：
10.1021/nn3006976
复制
发表时间：
2012-06-01
期刊：
影响因子：
17.1
通讯作者：
Tada, Hirokazu
中科院分区：
文献类型：
--
作者：
Lee, See Kei;Yamada, Ryo;Tada, Hirokazu
我们观察并分析了单低聚噻吩分子线中电导的普遍温度交叉行为。在 5.6 nm 的临界分子线长度处发现了高温下的阿伦尼乌斯型温度依赖性和低温下的温度不变行为之间的交叉，我们发现从指数长度依赖性到长度不变行为的变化。我们对交叉行为的起源进行了尺度函数分析。在确保分析符合凯尔迪什格林函数计算对温度依赖性的解释后，我们将其应用于我们的实验结果，并成功发现我们的缩放函数给出了整个温度范围内温度依赖性的通用描述。
We have observed and analyzed a universal temperature crossover behavior of electrical conductance in a single oligothiophene molecular wire. The crossover between the Arrhenius-type temperature dependence at high temperature and the temperature-invariant behavior at low temperature is found at a critical molecular wire length of 5.6 nm, where we found a change from the exponential length dependence to the length-invariant behavior. We have derived a scaling function analysis for the origin of the crossover behavior. After assuring that the analysis fits the explanation of the Keldysh Green's function calculation for the temperature dependence, we have applied it to our experimental results and found successfully that our scaling function gives a universal description of the temperature dependence for all over the temperature range.