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arXiv 0706.3418cond-mat.str-elcond-mat.mes-hall
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自旋非相干Luttinger液体-超导体混合系统的量子态密度、对关联和约瑟夫森电流

Tunneling Density of States, Pair Correlation, and Josephson Current in Spin-Incoherent Luttinger Liquid-Superconductor Hybrid Systems

Dagim Tilahun, Gregory A. Fiete

摘要:

我们研究了一个由自旋非相干的Luttinger液体在一端或两端邻接到超导体组成的混合系统。我们发现隧穿态密度在低能量下发散,并表现出与系统中相互作用强度无关的普遍频率依赖性。我们表明,尽管对相关性指数衰减到自旋不相干的Luttinger液体的距离,约瑟夫森电流仍然强大。与零温Luttinger液体的情况相比,临界电流减少了2倍,超导体之间的相位差周期减半。我们的研究结果开辟了一个新的一类实验中的自旋非相干制度的一维系统。

英文摘要:

We study a hybrid system consisting of a spin-incoherent Luttinger liquid adjoined at one or both ends to a superconductor. We find the tunneling density of states diverges at low energies and exhibits a universal frequency dependence independent of the strength of the interactions in the system. We show that in spite of exponentially decaying pair correlations with distance into the spin-incoherent Luttinger liquid, the Josephson current remains robust. Compared to the zero temperature Luttinger liquid case there is a factor of 2 reduction in the critical current and a halving of the period in the phase difference between the superconductors. Our results open the way for a new class of experiments in the spin-incoherent regime of one dimensional systems.

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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