近藤绝缘体SmB $_6$的拓扑性质及其对Sm空位的敏感性
Topological nature of the Kondo insulator SmB$_6$ and its sensitiveness to Sm vacancy
摘要：
近藤绝缘体SmB $_6$的真正拓扑性质仍有待揭开。我们之前的隧道研究不仅发现了表面狄拉克费米子存在的证据，而且还发现它们本质上与自旋激子（体中的集体激发）相互作用。我们已经扩展了这样的光谱调查到晶体中含有Sm的不足。的散装杂化间隙被认为是不敏感的不足1%，这里研究，但表面状态的Sm-缺乏晶体表现出完全不同的温度演变从那些在化学计量的。我们把这归因于拓扑表面状态保持不相干的最低测量温度，由于它们与自旋激子的持续相互作用，保持未凝聚。这一结果表明，详细的拓扑性质的SmB $_6$可以急剧变化，在晶格中的无序的存在。这种对无序的敏感性似乎与著名的拓扑保护相矛盾，但它可以被理解为是由于强相关性和拓扑效应之间的密切相互作用。
英文摘要：
The true topological nature of the Kondo insulator SmB$_6$ remains to be unveiled. Our previous tunneling study not only found evidence for the existence of surface Dirac fermions, but it also uncovered that they inherently interact with the spin excitons, collective excitations in the bulk. We have extended such a spectroscopic investigation into crystals containing a Sm deficiency. The bulk hybridization gap is found to be insensitive to the deficiency up to 1% studied here, but the surface states in Sm-deficient crystals exhibit quite different temperature evolutions from those in stoichiometric ones. We attribute this to the topological surface states remaining incoherent down to the lowest measurement temperature due to their continued interaction with the spin excitons that remain uncondensed. This result shows that the detailed topological nature of SmB$_6$ could vary drastically in the presence of disorder in the lattice. This sensitiveness to disorder is seemingly contradictory to the celebrated topological protection, but it can be understood as being due to the intimate interplay between strong correlations and topological effects.
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