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arXiv 1503.01905cond-mat.supr-concond-mat.mes-hall
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约瑟夫森结阵列中的宇称效应

The parity effect in Josephson junction arrays

Jared H. Cole, Andreas Heimes, Timothy Duty, Michael Marthaler

摘要:

研究了由多个超导岛组成的电路中准粒子的宇称效应和输运。我们开发了一个通用的方法,并表明它是等价于以前的方法描述的奇偶校验效果在其更有限的制度的有效性。作为一个例子,我们研究了在可忽略的约瑟夫森能量的限制下,通过线性阵列的约瑟夫森结的输运,并观察到宇称效应的出现与非平衡准粒子的数量减少。由于相关电荷状态的数量随着长度的增加而呈指数增加,在多结阵列中,奇偶效应以与两结情况不同的方式表现出来。电荷无序的作用也被研究,因为这隐藏了许多否则会被观察到的宇称物理。尽管如此,我们看到,在低偏压下通过多结阵列的电流受到亚稳定偶宇称态形成的限制。

英文摘要:

We study the parity effect and transport due to quasiparticles in circuits comprised of many superconducting islands. We develop a general approach and show that it is equivalent to previous methods for describing the parity effect in their more limited regimes of validity. As an example we study transport through linear arrays of Josephson junctions in the limit of negligible Josephson energy and observe the emergence of the parity effect with decreasing number of non-equilibrium quasiparticles. Due to the exponential increase in the number of relevant charge states with increasing length, in multi-junction arrays the parity effect manifests in qualitatively different ways to the two junction case. The role of charge disorder is also studied as this hides much of the parity physics which would otherwise be observed. Nonetheless, we see that the current through a multi-junction array at low bias is limited by the formation of meta-stable even-parity states.

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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