Topological metals possess gapless band structures accompanied by nontrivial edge states. Topological metals are created from the topological insulators by adjusting the magnetic flux. Here we propose the time-reversal symmetry protected topological metal without employing the magnetic flux. Topological metallic phase presents although the Chern number vanishes. In the topologically nontrivial phase, three different cases in the metallic phase are distinguished from the band-touching and in-gap features of the topological edge states. These findings shed light on the time-reversal symmetric topological metals and greatly simplify the realization of topological metals.

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时间反转对称拓扑金属

拓扑金属具有无间隙带结构，伴随着非平凡的边缘状态。通过调整磁通量从拓扑绝缘体产生拓扑金属。在这里，我们提出了不使用磁通量的时间反转对称保护拓扑金属。尽管陈数消失，但拓扑金属相仍存在。在拓扑非平凡相中，金属相中的三种不同情况与拓扑边缘态的能带接触和带隙特征不同。这些发现揭示了时间反转对称拓扑金属，并大大简化了拓扑金属的实现。