Min Chul-Hee, Goth F, Lutz P, Bentmann H, Kang B Y, Cho B K, Werner J, Chen K-S, Assaad F, Reinert F
Experimentelle Physik VII and Röntgen Research Center for Complex Materials (RCCM), Universität Würzburg, 97074, Würzburg, Germany.
Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074, Würzburg, Germany.
Sci Rep. 2017 Sep 20;7(1):11980. doi: 10.1038/s41598-017-12080-5.
Paramagnetic heavy fermion insulators consist of fully occupied quasiparticle bands inherent to Fermi liquid theory. The gap emergence below a characteristic temperature is the ultimate sign of coherence for a many-body system, which in addition can induce a non-trivial band topology. Here, we demonstrate a simple and efficient method to compare a model study and an experimental result for heavy fermion insulators. The temperature dependence of the gap formation in both local moment and mixed valence regimes is captured within the dynamical mean field (DMFT) approximation to the periodic Anderson model (PAM). Using the topological coherence temperature as the scaling factor and choosing the input parameter set within the mixed valence regime, we can unambiguously link the theoretical energy scales to the experimental ones. As a particularly important result, we find improved consistency between the scaled DMFT density of states and the photoemission near-gap spectra of samarium hexaboride (SmB).
顺磁重费米子绝缘体由费米液体理论中完全占据的准粒子能带组成。在特征温度以下出现能隙是多体系统相干性的最终标志，此外还可诱导非平凡的能带拓扑结构。在此，我们展示了一种简单有效的方法，用于比较重费米子绝缘体的模型研究和实验结果。在周期安德森模型（PAM）的动态平均场（DMFT）近似下，捕捉了局域矩和混合价态区域中能隙形成的温度依赖性。使用拓扑相干温度作为标度因子，并在混合价态区域内选择输入参数集，我们可以明确地将理论能量标度与实验能量标度联系起来。作为一个特别重要的结果，我们发现标度后的DMFT态密度与六硼化钐（SmB）的光发射近能隙光谱之间的一致性得到了改善。
