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Cascade of correlated electron states in the kagome superconductor CsV_3Sb_5

机译：Kagome超导体CSV_3SB_5的相关电子状态的级联

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摘要

The kagome lattice of transition metal atoms provides an exciting platform to study electronic correlations in the presence of geometric frustration and nontrivial band topology(1-18), which continues to bear surprises. Here, using spectroscopic imaging scanning tunnelling microscopy, we discover a temperature-dependent cascade of different symmetry-broken electronic states in a new kagome superconductor, CsV3Sb5. We reveal, at a temperature far above the superconducting transition temperature T-c similar to 2.5 K, a tri-directional charge order with a 2a(0) period that breaks the translation symmetry of the lattice. As the system is cooled down towards T-c, we observe a prominent V-shaped spectral gap opening at the Fermi level and an additional breaking of the six-fold rotational symmetry, which persists through the superconducting transition. This rotational symmetry breaking is observed as the emergence of an additional 4a(0) unidirectional charge order and strongly anisotropic scattering in differential conductance maps. The latter can be directly attributed to the orbital-selective renormalization of the vanadium kagome bands. Our experiments reveal a complex landscape of electronic states that can coexist on a kagome lattice, and highlight intriguing parallels to high-T-c superconductors and twisted bilayer graphene.
机译：过渡金属原子的Kagome格子提供了一种令人兴奋的平台，用于研究几何挫折和非动力磁带拓扑（1-18）的电子相关性，这继续承受惊喜。这里，使用光谱成像扫描隧道显微镜，我们发现在新的Kagome超导体CSV3SB5中的不同对称破碎电子状态的温度依赖性级联。我们在远高于超导转变温度T-C的温度下揭示了类似于2.5 k的三维电荷顺序，其中具有2A（0）周期的三维电荷顺序，该时间段断开晶格的平移对称性。当系统被冷却到T-C时，我们观察到在费米水平处的突出的V形光谱间隙开口和六倍旋转对称的额外断开，这仍然通过超导转变。该旋转对称性破裂被观察到作为额外的4A（0）单向电荷顺序的出现，并且在差分电导图中强烈各向异性散射。后者可以直接归因于钒kagome带的轨道选择性重整化。我们的实验揭示了一种复杂的电子状态景观，可以在Kagome晶格上共存，并将有趣的平方突出至高T-C超导体和扭曲的双层石墨烯。

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  • 来源
    《Nature》 |2021年第7884期|216-221|共6页
  • 作者

    Zhao He; Li Hong; Ortiz Brenden R.; Teicher Samuel M. L.; Park Takamori; Ye Mengxing; Wang Ziqiang; Balents Leon; Wilson Stephen D.; Zeljkovic Ilija;

  • 作者单位

    Boston Coll Dept Phys Chestnut Hill MA 02167 USA;

    Boston Coll Dept Phys Chestnut Hill MA 02167 USA;

    Univ Calif Santa Barbara Mat Dept Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Calif Nanosyst Inst Santa Barbara CA 93106 USA;

    Univ Calif Santa Barbara Mat Dept Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Calif Nanosyst Inst Santa Barbara CA 93106 USA;

    Univ Calif Santa Barbara Dept Phys Santa Barbara CA 93106 USA;

    Univ Calif Santa Barbara Kavli Inst Theoret Phys Santa Barbara CA USA;

    Boston Coll Dept Phys Chestnut Hill MA 02167 USA;

    Univ Calif Santa Barbara Kavli Inst Theoret Phys Santa Barbara CA USA|Canadian Inst Adv Res Toronto ON Canada;

    Univ Calif Santa Barbara Mat Dept Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Calif Nanosyst Inst Santa Barbara CA 93106 USA;

    Boston Coll Dept Phys Chestnut Hill MA 02167 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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