Interplay between impurities and correlations in superconducting nanorings
Interplay between impurities and correlations in superconducting nanorings
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DOI：
10.1103/physrevb.72.035320
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发表时间：
2005-03
影响因子：
3.7
通讯作者：
K. Czajka;M. Maśka;M. Mierzejewski;Ż. Śledź
中科院分区：
文献类型：
--
作者：
K. Czajka;M. Maśka;M. Mierzejewski;Ż. Śledź
利用两种互补的方法数值分析了具有电子关联和杂质的纳米环的性质。也就是说，我们进行精确的对角化系统的几个晶格网站和Bogoliubov-德Gennes方程的研究系统组成的几百个网站。我们演示了系统的属性是如何受到各种配置的杂质的排斥和吸引力的电子-电子相互作用。在有吸引力的相互作用的情况下，我们表明，纳米级的性能主要是由配对和形成的密度波的倾向之间的竞争。由于杂质作为密度波的钉扎中心，它们的构型决定了这种竞争的结果。
The properties of nanoscopic rings with electronic correlations and impurities are analyzed numerically by means of two complementary methods. Namely, we perform exact diagonalization of systems up to several lattice sites and Bogoliubov-de Gennes-equations studies of systems consisting of a few hundred sites. We demonstrate how the properties of the systems are affected by various configurations of impurities for both repulsive and attractive electron-electron interactions. In the case of attractive interaction we show that the nanoscopic properties are mainly determined by the competition between tendencies toward pairing and formation of the density waves. Since the impurities act as pinning centers for the density waves, their configuration determines the result of this competition.