磁合金SmB6中的鲁棒表面态和相干现象
Robust surface states and coherence phenomena in magnetically alloyed SmB6
摘要：
六硼化钐是拓扑近藤绝缘体状态的候选者，其中近藤相干性被预测产生由拓扑表面状态跨越的绝缘间隙。在这里，我们调查的表面和体电子性质的磁合金Sm 1-xMxB 6（M=Ce，Eu），使用角分辨光电子能谱（ARPES）和互补的表征技术。值得注意的是，拓扑非平凡的体和表面能带结构被发现坚持高度改性的样品中，高达30%的Sm取代，并共存的情况下，Eu掺杂的反铁磁性。结果被解释的层次结构的能量尺度，其中表面态的出现与形成直接近藤差距，而低温运输的趋势取决于间接的差距。
英文摘要：
Samarium hexaboride is a candidate for the topological Kondo insulator state, in which Kondo coherence is predicted to give rise to an insulating gap spanned by topological surface states. Here we investigate the surface and bulk electronic properties of magnetically alloyed Sm1-xMxB6 (M=Ce, Eu), using angle-resolved photoemission spectroscopy (ARPES) and complementary characterization techniques. Remarkably, topologically nontrivial bulk and surface band structures are found to persist in highly modified samples with up to 30% Sm substitution, and to coexist with antiferromagnetism in the case of Eu doping. The results are interpreted in terms of a hierarchy of energy scales, in which surface state emergence is linked to the formation of a direct Kondo gap, while low temperature transport trends depend on the indirect gap.
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