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首页> 外文期刊>Physical Review X >Three-Dimensional Charge Density Wave and Surface-Dependent Vortex-Core States in a Kagome Superconductor CsV 3 Sb 5
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Three-Dimensional Charge Density Wave and Surface-Dependent Vortex-Core States in a Kagome Superconductor CsV 3 Sb 5

机译：在Kagome超导体CSV 3 SB 5中的三维电荷密度波和表面依赖性涡旋核状态

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The transition-metal-based kagome metals provide a versatile platform for correlated topological phases hosting various electronic instabilities. While superconductivity is rare in layered kagome compounds, its interplay with nontrivial topology could offer an engaging space to realize exotic excitations of quasiparticles. Here, we use scanning tunneling microscopy to study a newly discovered Z 2 topological kagome metal CsV 3 Sb 5 with a superconducting ground state. We observe charge modulation associated with the opening of an energy gap near the Fermi level. When across single-unit-cell surface step edges, the intensity of this charge modulation exhibits a π -phase shift, suggesting a three-dimensional 2 × 2 × 2 charge density wave ordering. Interestingly, while conventional Caroli–de?Gennes–Matricon bound states are observed inside the superconducting vortex on the Sb surfaces, a robust zero-bias conductance peak emerges that does not split in a large distance when moving away from the vortex center on the Cs 2 × 2 surfaces, resembling the Majorana bound states arising from the superconducting Dirac surface states in Bi 2 Te 3 / NbSe 2 heterostructures. Our findings establish CsV 3 Sb 5 as a promising candidate for realizing exotic excitations at the confluence of nontrivial lattice geometry, topology and multiple electronic orders.
机译：基于过渡金属的Kagome金属为托管各种电子稳定性的相关拓扑阶段提供了一种多功能平台。虽然层状kagome化合物中的超导是罕见的，但其与非增长拓扑的相互作用可以提供用于实现Quasiply的异国激励的接合空间。这里，我们使用扫描隧穿显微镜，以研究具有超导地位的新发现的z 2拓扑kagome金属csv 3 sb 5。我们观察与在费米水平附近的能隙开口相关的充电调制。当跨越单个单元细胞表面步骤边缘时，该电荷调制的强度表现出π形移位，表明三维2×2×2充电密度波排序。有趣的是，虽然在SB表面上的超导涡流内观察到常规Caroli-de？Gennes-Matricon绑定状态，但是在远离CS上的涡流中心移动时，稳健的零偏置电导峰值不会在大距离中分开2×2表面，类似于Bi 2 Te 3 / Nbse 2异质结构中超导Dirac表面状态产生的Majorana绑定状态。我们的调查结果建立了CSV 3 SB 5，作为在非竞争格子几何形状，拓扑和多个电子订单的汇合处实现异国情调激励的有希望的候选者。

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