空穴掺杂LaTe2中元素取代导致的新兴交织CDW未占据态
Emergent interweaved CDW unoccupied states in hole-doping LaTe2 with element substitution
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中文总结 AI 辅助
研究通过STM对LaTe1.6Sb0.4晶体研究空穴掺杂LaTe2的交织CDW，观察到三个交织CDW波矢，验证q1和q3是连接特定能带的嵌套矢量，还检测到相关卫星点，为探索空穴/电子掺杂材料中交织CDW起源提供关键见解。
中文摘要 AI 辅助
多种具有电荷密度波（CDW）有序的层状稀土碲化物因其非常规的CDW形成、高转变温度以及轴向希格斯模式的存在而成为研究热点。近期通过透射电子显微镜（TEM）和角分辨光电子能谱（ARPES）对LaTe2及其元素取代相LaTe2 - xSbx中的交织CDW进行了研究，但TEM图案中一些复杂衍射特征仍未阐明。本文在9K下对LaTe1.6Sb0.4晶体进行扫描隧道显微镜（STM）研究，观察到三个交织CDW波矢，理论上验证了q1和q3是连接px和py能带的嵌套矢量，还检测到与11 - a - 超晶格主布拉格点p相关的卫星点。研究结果为进一步探索空穴/电子掺杂材料中交织CDW的起源提供了关键见解。
英文摘要
Multiple CDW-ordered layered rare-earth tellurides have increasingly emerged as a research hotspot, owing to their unconventional CDW formation, high transition temperature, and confirmed existence of axial Higgs modes. Recently, interweaved CDW in LaTe2 and its element-substituted phase LaTe2-xSbx have been investigated through TEM and ARPES measurements, revealing their distinct origins. Nevertheless, several complex diffraction features observed in TEM patterns remain unelucidated. In this work, we carried out scanning tunneling microscopy (STM) on LaTe1.6Sb0.4 crystals at 9 K. Three interweaved CDW wave vectors, q1=8/11a*, q2=5/11a* and q3=3/11a* were observed, which are induced by hole doping in unoccupied states. The q1 and q3 are theoretically verified to be nesting vectors connecting px- and py- bands. Furthermore, the satellite spots relative to the main Bragg spots p corresponding to a 11-a-superlattice have also been detected. Our findings provide critical insights for further exploring the origin of the interweaved CDW in hole/electron doping materials.
