Weyl-Kondo semimetal in heavy-fermion systems.
Weyl-Kondo semimetal in heavy-fermion systems.
复制标题
重毛顶系统中的Weyl-Kondo半学。
DOI：
10.1073/pnas.1715851115
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发表时间：
2018-01-02
影响因子：
11.1
通讯作者：
Si Q
中科院分区：
文献类型：
--
作者：
Lai HH;Grefe SE;Paschen S;Si Q
虽然具有非平凡拓扑结构的电子态传统上在绝缘体中是已知的，但在过去的2年中，它们在金属中得到了证明。这样的外尔半金属显示拓扑保护，同时在本体和表面上导电。一个突出的问题是，拓扑保护是否可以发生在具有强相关性的金属中。在这里，我们报告的理论工作强相关晶格模型，以证明出现的Weyl-Kondo半金属。我们确定外尔费米子的体积和费米弧的表面上，这两者都与多体现象称为近藤效应。我们确定一个关键的签名，这是实现在最近发现的重费米子化合物的Weyl-Kondo半金属。绝缘态可以是拓扑非平凡的，这是一个公认的概念，由量子霍尔效应和拓扑绝缘体所例证。相比之下，拓扑金属直到最近才被实验证明。在具有强相关性的系统中，它们尚未被识别。重费米子半金属是强关联系统的原型，鉴于它们强的自旋-轨道耦合，呈现出取得进展的自然环境。在这里，我们提出了一个Weyl-Kondo半金属相的周期安德森模型上的非中心对称晶格。外尔节点附近的准粒子是从近藤效应发展出来的，费米弧的表面态也是如此。我们确定了这一阶段的关键签名，这是实现在重费米子半金属Ce 3Bi 4Pd 3。我们的研究结果提供了迫切需要的理论基础的实验搜索拓扑金属具有强相关性，并开辟了一条途径，系统研究这种量子相位，自然纠缠多个自由度。
While electronic states with nontrivial topology have traditionally been known in insulators, they have been evidenced in metals during the past 2 years. Such Weyl semimetals show topological protection while conducting electricity both in the bulk and on the surface. An outstanding question is whether topological protection can happen in metals with strong correlations. Here, we report theoretical work on a strongly correlated lattice model to demonstrate the emergence of a Weyl–Kondo semimetal. We identify Weyl fermions in the bulk and Fermi arcs on the surface, both of which are associated with the many-body phenomenon called the Kondo effect. We determine a key signature of this Weyl–Kondo semimetal, which is realized in a recently discovered heavy-fermion compound. Insulating states can be topologically nontrivial, a well-established notion that is exemplified by the quantum Hall effect and topological insulators. By contrast, topological metals have not been experimentally evidenced until recently. In systems with strong correlations, they have yet to be identified. Heavy-fermion semimetals are a prototype of strongly correlated systems and, given their strong spin-orbit coupling, present a natural setting to make progress. Here, we advance a Weyl–Kondo semimetal phase in a periodic Anderson model on a noncentrosymmetric lattice. The quasiparticles near the Weyl nodes develop out of the Kondo effect, as do the surface states that feature Fermi arcs. We determine the key signatures of this phase, which are realized in the heavy-fermion semimetal Ce3Bi4Pd3. Our findings provide the much-needed theoretical foundation for the experimental search of topological metals with strong correlations and open up an avenue for systematic studies of such quantum phases that naturally entangle multiple degrees of freedom.
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影响因子：
3.7
作者：
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通讯作者：
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影响因子：
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作者：
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