Spin-orbital entangled excitonic insulator with quadrupole order
Spin-orbital entangled excitonic insulator with quadrupole order
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DOI：
10.1103/physrevb.99.075117
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发表时间：
2016-03
影响因子：
3.7
通讯作者：
Toshihiro Sato;T. Shirakawa;S. Yunoki
中科院分区：
文献类型：
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作者：
Toshihiro Sato;T. Shirakawa;S. Yunoki
利用多轨道动力学平均场理论研究了具有相对论自旋轨道耦合的三轨道Hubbard模型的基态。我们证明了强电子关联和SOC之间的相互作用诱导了一个货车Vleck型磁绝缘体和它的磁激子凝聚。我们还发现，在适度的电子相关制度的SOC诱导另一种类型的非线性激子绝缘体，除了相对论带绝缘体。这些绝缘体之间的特征表现在动量分辨的单粒子激发，从而获得角分辨光电子能谱实验。
We employ the multi-orbital dynamical mean-field theory to examine the ground state of a three-orbital Hubbard model with a relativistic spin-orbit coupling (SOC) at four electrons per site. We demonstrate that the interplay between the strong electron correlations and the SOC induces a Van Vleck-type nonmagnetic insulator and its magnetic exciton condensation. We also find in the moderate electron correlation regime that the SOC induces another type of a nonmagnetic excitonic insulator, in addition to a relativistic band insulator. The characteristic features among these insulators are manifested in the momentum resolved single-particle excitations, thus accessible by angle-resolved photoemission spectroscopy experiments.