Effects of nanoscale spatial inhomogeneity in strongly correlated systems
Effects of nanoscale spatial inhomogeneity in strongly correlated systems
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DOI：
10.1103/physrevb.71.125130
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发表时间：
2005-02
影响因子：
3.7
通讯作者：
M. F. Silva;N. A. Lima;A. Malvezzi;K. Capelle
中科院分区：
文献类型：
--
作者：
M. F. Silva;N. A. Lima;A. Malvezzi;K. Capelle
我们计算了具有在位相互作用和在位势周期性调制的Hubbard超晶格的基态能量和密度分布。密度矩阵重整化群和密度泛函方法的使用和比较。我们发现，在现场的潜力$v_i$的小变化可以模拟，取消，甚至过度补偿的影响，由于在现场的相互作用$U_i$更大的变化。我们的研究结果强调了纳米级空间不均匀性在强相关系统中的重要性，并呼吁重新审视假设空间均匀性的模型计算。
We calculate ground-state energies and density distributions of Hubbard superlattices characterized by periodic modulations of the on-site interaction and the on-site potential. Both density-matrix renormalization group and density-functional methods are employed and compared. We find that small variations in the on-site potential $v_i$ can simulate, cancel, or even overcompensate effects due to much larger variations in the on-site interaction $U_i$. Our findings highlight the importance of nanoscale spatial inhomogeneity in strongly correlated systems, and call for reexamination of model calculations assuming spatial homogeneity.