Fe(Te, Se)高温超导体的拓扑磁力线缺陷

Xianxin Wu, Jia-Xin Yin, Chao-Xing Liu, Jiangping Hu
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引用次数: 8

摘要

凝聚态中马约拉纳零模式的实现已经引起了诸如拓扑量子计算等基础科学领域的极大兴趣。近年来,铁基超导体被认为是实现拓扑超导和马约拉纳模式的高温平台。作为非常规超导体,它们最重要的特征之一是由于铁原子中的强亨德耦合,它们处于磁性态附近。本文提出Fe(Se, Te)超导体中缺失Te/Se阴离子的线缺陷提供了具有Rashba自旋轨道耦合的本征反铁磁(AFM)链的实现。与传统观点相反,马约拉纳零模式(MZMs)可以在这些AFM链末端鲁棒地产生。这些结果可以一致地解释最近通过扫描隧道显微镜(STM)测量的单层Fe(Te, Se)/SrTiO3线缺陷的零能末端状态的实验观察。我们的研究不仅展示了原生线缺陷、紧急磁性和拓扑超导性之间前所未有的相互作用,而且还探索了马约拉纳费米子的高温平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Topological magnetic line defects in Fe(Te, Se) high-temperature superconductors

The realization of Majorana zero modes in condensed matter have been attracting enormous interests from fundamental science such as topological quantum computation. Recently iron based superconductors were identified as a high-temperature platform for realizing topological superconductivity and Majorana modes. As unconventional superconductors, one of the most important characteristics of them is that they are in the vicinity of magnetic states due to the strong Hund’s coupling in iron atoms. Here we propose that the line defects with missing Te/Se anions in Fe(Se, Te) superconductors provide the realization of intrinsic antiferromagnetic (AFM) chains with Rashba spin-orbit coupling. Against conventional wisdom, Majorana zero modes (MZMs) can be robustly generated at these AFM chain ends. These results can consistently explain the recent experimental observation of zero-energy end states in line defects of monolayer Fe(Te, Se)/SrTiO3 by scanning tunneling microscopy (STM) measurements. Our research not only demonstrates an unprecedented interplay among native line defect, emergent magnetism and topological superconductivity but also explores a high-temperature platform for Majorana fermions.

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