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arXiv 1408.4847cond-mat.str-el
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有限温度下相互作用拓扑蜂窝格子模型的元胞动力学平均场论研究

Cellular dynamical mean-field theory study of an interacting topological honeycomb lattice model at finite temperature

Yao-Hua Chen, Hsiang-Hsuan Hung, Guoxiong Su, Gregory A. Fiete, C. S. Ting

摘要:

由自旋轨道耦合引起的拓扑相是近年来研究的热点。在这项工作中,我们使用细胞动力学平均场论与连续时间量子Monte Carlo求解器研究的Kane-Mele-哈伯德模型补充了一个额外的第三邻居跳跃项。对于弱相互作用,第三近邻跳跃项驱动拓扑绝缘体和平凡绝缘体之间的拓扑相变,与先前的费米子无符号量子Monte Carlo结果一致[H.- Hung等人,B89,235104(2014)]。在有限温度下,零温度拓扑相边界的狄拉克锥在第三近邻跳跃中产生有限宽度的金属区。此外,我们扩展到强耦合制度的相互作用的范围,并发现一个容易的平面反铁磁绝缘状态跨越广泛的第三邻居跳跃。与弱耦合情况相比,在强耦合情况下没有拓扑相变发生,并且基态是平凡的反铁磁绝缘态。提供了一个全面的有限温度相图在相互作用的第三近邻跳跃平面。

英文摘要:

Topological phases originating from spin-orbit coupling have attracted great attention recently. In this work, we use cellular dynamical mean field theory with the continuous-time quantum Monte Carlo solver to study the Kane-Mele-Hubbard model supplemented with an additional third-neighbor hopping term. For weak interactions, the third-neighbor hopping term drives a topological phase transition between a topological insulator and a trivial insulator, consistent with previous fermion sign-free quantum Monte Carlo results [H.-Hung et al., Phys. Rev. B 89, 235104 (2014)]. At finite temperatures, the Dirac cones of the zero temperature topological phase boundary give rise to a metallic regime of finite width in the third-neighbor hopping. Furthermore, we extend the range of interactions into the strong coupling regime and find an easy-plane anti-ferromagnetic insulating state across a wide range of third-neighbor hopping. In contrast to the weak coupling regime, no topological phase transition occurs at strong coupling, and the ground state is a trivial anti-ferromagnetic insulating state. A comprehensive finite temperature phase diagram in the interaction-third-neighbor hopping plane is provided.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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