arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.09405cond-mat.mes-hallcond-mat.str-el
收藏

二维拓扑反铁磁体边缘的螺旋Luttinger液体

Helical Luttinger liquid on the edge of a 2-dimensional topological antiferromagnet

Yang Feng, Jinjiang Zhu, Weiyan Lin, Zichen Lian, Yongchao Wang, Hao Li, Hongxu Yao, Qiushi He, Yinping Pan, Yang Wu, Jinsong Zhang, Yayu Wang, Xiaodong Zhou, Jian Shen, Yihua Wang

AI总结:

本研究在偶数层MnBi₂Te₄拓扑反铁磁体边缘观测到螺旋Luttinger液体(HLL),通过扫描超导量子干涉器件验证了其螺旋边缘电流与幂律电导标度行为,为可调拓扑物质在自旋电子学和量子计算中的应用提供了新平台。

摘要:

体时间反演对称性破缺的边界螺旋Luttinger液体(HLL)属于一类独特的拓扑物态,可能存在于反铁磁体(AFM)中。本研究在近期发现的拓扑反铁磁体偶数层MnBi₂Te₄的边缘,探寻HLL的特征信号。利用扫描超导量子干涉器件,我们直接观测到反铁磁基态下电荷中性点处出现的螺旋边缘电流。这种螺旋边缘态伴随着绝缘体态,磁场驱动的量子相变表明,该绝缘体态与铁磁陈绝缘体相具有拓扑上的区别。反铁磁序的边缘电导随温度和源漏偏压的变化遵循幂律关系,这是HLL存在的有力证据。在低于量子临界点的有限磁场下,这种HLL标度行为保持稳定。在层状反铁磁半导体中观测到的HLL,代表了一种高度可调的拓扑物质,可适配未来的自旋电子学和量子计算研究。

英文摘要:

Boundary helical Luttinger liquid (HLL) with broken bulk time-reversal symmetry belongs to a unique topological class which may occur in antiferromagnets (AFM). Here, we search for signatures of HLL on the edge of a recently discovered topological AFM, MnBi2Te4 even-layer. Using scanning superconducting quantum interference device, we directly image helical edge current in the AFM ground state appearing at its charge neutral point. Such helical edge state accompanies an insulating bulk which is topologically distinct from the ferromagnetic Chern insulator phase as revealed in a magnetic field driven quantum phase transition. The edge conductance of the AFM order follows a power-law as a function of temperature and source-drain bias which serves as strong evidence for HLL. Such HLL scaling is robust at finite fields below the quantum critical point. The observed HLL in a layered AFM semiconductor represents a highly tunable topological matter compatible with future spintronics and quantum computation.

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。

↑