铅基三元碲化物Pb（Bi1-xSbx）2 Te 4拓扑表面态的直接观测
Direct Observation of the Topological Surface States in Lead-Based Ternary Telluride Pb(Bi1-xSbx)2Te4
摘要：
我们对Pb（Bi 1-xSbx）2 Te 4进行了角分辨光电子能谱研究。Pb（Bi 1-xSbx）2 Te 4是铅基三元碲化物中的一员，理论上被认为是一类新的三维拓扑绝缘体（TI）的候选材料。在PbBi 2 Te 4中，我们发现了一个具有六边形变形的Dirac-cone带色散的拓扑表面态，这表明该材料是在布里渊区中心具有单一拓扑表面态的强TI。用Sb部分取代Bi引起狄拉克载流子浓度的显著变化，导致狄拉克载流子的符号从n型变为p型。Pb（Bi_（1-x）Sbx）_2 Te_4系统的可调谐Dirac载流子为研究奇异拓扑现象提供了一个新的平台。
英文摘要：
We have performed angle-resolved photoemission spectroscopy on Pb(Bi1-xSbx)2Te4, which is a member of lead-based ternary tellurides and has been theoretically proposed as a candidate for a new class of three-dimensional topological insulators (TIs). In PbBi2Te4, we found a topological surface state with a hexagonally deformed Dirac-cone band dispersion, indicating that this material is a strong TI with a single topological surface state at the Brillouin-zone center. Partial replacement of Bi with Sb causes a marked change in the Dirac carrier concentration, leading to the sign change of Dirac carriers from n-type to p-type. The Pb(Bi1-xSbx)2Te4 system with tunable Dirac carriers thus provides a new platform for investigating exotic topological phenomena.
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