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首页> 外文期刊>The European physical journal, B. Condensed matter physics >Two-orbital systems with crystal field splitting and interorbital hopping
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Two-orbital systems with crystal field splitting and interorbital hopping

机译：具有晶体场分裂和轨道间跳变的双轨道系统

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The nondegenerate two-orbital Hubbard model is studied within the dynamic mean-field theory to reveal the influence of two important factors, i.e. crystal field splitting and interorbital hopping, on orbital selective Mott transition (OSMT) and realistic compound Ca2xSrxRuO4. A distinctive feature of the optical conductivity of the two nondegenerate bands is found in OSMT phase, where the metallic character of the wide band is indicated by a nonzero Drude peak, while the insulating narrow band has its Drude peak drop to zero in the mean time. We also find that the OSMT regime expands profoundly with the increase of interorbital hopping integrals. On the contrary, it is shown that large and negative level splitting of the two orbitals diminishes the OSMT regime completely. Applying the present findings to compound Ca2xSrxRuO4, we demonstrate that in the doping region from x = 0.2 to 2.0, the negative level splitting is unfavorable to the OSMT phase.
机译：在动态平均场理论中研究了非退化的两轨道Hubbard模型，以揭示两个重要因素（即晶体场分裂和轨道间跳变）对轨道选择性Mott跃迁（OSMT）和现实化合物Ca2xSrxRuO4的影响。在OSMT阶段发现了两个非简并带的光导率的显着特征，其中宽带的金属特性由非零的Drude峰表示，而绝缘的窄带的Drude峰在此期间降为零。 。我们还发现，随着轨道间跳变积分的增加，OSMT机制也发生了深刻的扩展。相反，显示出两个轨道的大而负的水平分裂完全减小了OSMT机制。将当前发现应用于化合物Ca2xSrxRuO4，我们证明在x = 0.2到2.0的掺杂区域中，负能级分裂不利于OSMT相。

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