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arXiv 1306.0462cond-mat.supr-con
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本征约瑟夫森结中的呼吸电荷密度波

Breathing Charge Density Waves in Intrinsic Josephson Junctions

Yu. M. Shukrinov, H. Abdelhafiz

摘要:

我们演示了在层状超导体中沿耦合约瑟夫森结堆叠产生电荷密度波(CDW)。每个超导层中的电荷围绕某个平均值振荡,形成呼吸CDW。我们显示的纵向等离子体波的CDW在相应的最外分支的状态下的转变。不同类型的CDW的有关的电流电压特性的内部分支之间的过渡被证明。外部电磁辐射对对应于内部分支的状态的影响与单个约瑟夫森结的情况有着本质的不同。叠层中结的IV特性中的Shapiro阶跃不直接对应于辐射频率$ω$。约瑟夫森结的系统表现得像一个单一的整体系统:总IV特性曲线中的夏皮罗阶跃或其谐波出现在电压$\sum V_l=N_R\frac{m}{n}ω$处,其中$V_l$是第$l$个结中的电压,$N_R$是旋转状态下JJ的数目,$m$和$n$是整数。

英文摘要:

We demonstrate the creation of a charge density wave (CDW) along a stack of coupled Josephson junctions in layered superconductors. Electric charge in each superconducting layer oscillates around some average value, forming a breathing CDW. We show the transformation of a longitudinal plasma wave to CDW in the state corresponding to the outermost branch. Transitions between different types of CDW's related to the inner branches of current voltage characteristics are demonstrated. The effect of the external electromagnetic irradiation on the states corresponding to the inner branches differs crucially from the case of the single Josephson junction. The Shapiro steps in the IV-characteristics of the junctions in the stack do not correspond directly to the frequency of radiation $ω$. The system of Josephson junctions behaves like a single whole system: the Shapiro steps or their harmonics in the total IV-characteristics appear at voltage $\sum V_l=N_R\frac{m}{n}ω$, where $V_l$ is the voltage in $l$-th junction, $N_R$ is the number of JJ in the rotating state, and $m$ and $n$ are integer numbers.

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