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arXiv 0811.3884cond-mat.str-el
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Luttinger液体中杂质钉扎对电导和specific heat的影响

Effect of impurity pinning on conduction and specific heat in the Luttinger liquid

S. N. Artemenko, S. V. Remizov, D. S. Shapiro, R. R. Vakhitov

摘要:

我们从理论上研究了两个与杂质脱钉相关的效应,这两个效应对于一维Luttinger液体(LL)和线性链CDW导体是常见的。首先,我们考虑了一维导电沟道中单个杂质的电子输运,并研究了在阈值电压以上与LL滑动相关的一种新的导电机制。在这种状态下的直流电流伴随着频率为$f =I/e$的振荡。这类似于线性链导体中的CDW脱钉扎、约瑟夫森效应和库仑阻塞。其次,我们发现,强钉扎的LL杂质导致的磁场依赖的低温比热类似于实验观察到的CDW化合物。我们解释这有利于形成的LL在直链化合物的可能性。

英文摘要:

We study theoretically two effects related to impurity depinning that are common for 1D Luttinger liquid (LL) and linear-chain CDW conductors. First, we consider the electron transport through a single impurity in a 1D conducting channel and study a new regime of conduction related to LL sliding at voltage above a threshold one. The DC current in this regime is accompanied by oscillations with frequency $f =I/e$. This resembles the CDW depinning in linear-chain conductors, the Josephson effect, and the Coulomb blockade. Second, we found that strong pinning of the LL by impurities leads to a magnetic field dependence of the low-temperature specific heat similar to that observed experimentally in CDW compounds. We interpret this in favor of possibility of formation of the LL in linear-chain compounds.

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