双杂质准粒子干涉的双曲条纹信号
Hyperbolic fringe signal for twin impurity quasiparticle interference
AI总结：
研究带隙超导体表面双杂质准粒子干涉中的双曲条纹信号，揭示其与超导序参数手性及变号特性的关联，为局部光谱分析提供新工具。
摘要：
我们研究了从带隙超导体（SC）表面一对相邻杂质发出的准粒子干涉（QPI）图样。我们发现，由于双杂质散射的环路贡献，QPI信号中可以出现双曲条纹（HF），其中两个杂质的位置是双曲焦点。对于单口袋费米面，HF图样标志着非磁性杂质的手性SC序，而非手性SC则需要磁性杂质。对于多口袋情形，如$s_{\pm}$波等变号序参数同样会产生HF特征。我们讨论了双杂质QPI作为补充局部光谱分析超导序的新工具。
英文摘要：
We study the quasiparticle interference (QPI) pattern emanating from a pair of adjacent impurities on the surface of a gapped superconductor (SC). We find that hyperbolic fringes (HF) in the QPI signal can appear due to the loop contribution of the two-impurity scattering, where the location of the two impurities are the hyperbolic focus points. For a single pocket Fermiology, an HF pattern signals chiral SC order for non-magnetic impurities and requires magnetic impurities for non-chiral SC. For a multi-pocket scenario, a sign-changing order parameter such as $s_{\pm}$-wave likewise yields an HF signature. We discuss twin impurity QPI as a new tool to complement the analysis of superconducting order from local spectroscopy.
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。
