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arXiv 2108.02546cond-mat.mes-hallquant-ph
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超导衬底中多轨道吸附原子的Yu-Shiba-Rusinov多重态和团簇:亚能隙格林函数方法

Yu-Shiba-Rusinov multiplets and clusters of multiorbital adatoms in superconducting substrates: Subgap Green's function approach

Liliana Arrachea

摘要:

本文讨论了s波对称超导衬底中具有经典磁矩的杂质团簇的Yu-Shiba-Rusinov态的全部特性。我们考虑了杂质的多轨道结构的影响和晶体场分裂的影响。我们精确地解决了这个问题,并计算了亚能隙格林函数,它在Shiba态的能量处具有极点,并定义了与它们的波函数相关的局域态密度。对于杂质充分分离的情况下,我们推导出一个有效的哈密顿量来描述由基板介导的杂交。我们分析了二聚体中杂质在不同的磁矩相对取向下的亚能隙激发谱的主要特征和谱密度。我们还说明了如何同样的形式主义适用于解决方案的三聚体与挫折的方向的磁矩。

英文摘要:

We discuss all the characteristics of Yu-Shiba-Rusinov states for clusters of impurities with classical magnetic moments in a superconducting substrate with s-wave symmetry. We consider the effect of the multiorbital structure of the impurities and the effect of the crystal field splitting. We solve the problem exactly and calculate the subgap Green's function, which has poles at the energies of the Shiba states and defines the local density of states associated to their wave functions. For the case of impurities sufficiently separated, we derive an effective Hamiltonian to describe the hybridization mediated by the substrate. We analyze the main features of the spectrum and the spectral density of the subgap excitations for impurities in dimer configurations with different relative orientations of the magnetic moments. We also illustrate how the same formalism applies for the solution of a trimer with frustration in the orientation of the magnetic moments.

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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