Nonequilibrium dynamics of multiorbital correlated electron system under time-dependent electric fields
Nonequilibrium dynamics of multiorbital correlated electron system under time-dependent electric fields
复制标题
时变电场下多轨道相关电子系统的非平衡动力学
DOI：
10.1002/pssb.201200792
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H. Onishi
中科院分区：
文献类型：
--
作者：
松岡秀展;鐘本勝一;橋本秀樹;H. Onishi
为了阐明轨道自由度在关联电子的多体电子态对外场响应中的关键作用，我们利用含时密度矩阵重整化群（DMRG）方法等数值方法研究了外加电场作用下的异轨道Hubbard模型的真实的时间动力学.没有施加电场的基态被发现是反铁磁/铁轨道态。在我们打开振荡电场之后，当所施加的电场的频率超过电荷激发间隙时，它引起了holon-doublon对的产生。我们认为，对跳跃过程产生的轨道配置的动力学变形。
To clarify a key role of orbital degrees of freedom in the response of the many‐body electron state of correlated electrons to an external field, we investigate the real‐time dynamics in aneg‐orbital Hubbard model under applied electric fields by exploiting numerical techniques such as a time‐dependent density‐matrix renormalization group (DMRG) method. The ground state without applying an electric field is found to be an antiferromagnetic/ferro‐orbital state. After we switch on an oscillating electric field, it gives rise to the creation of holon–doublon pairs when the frequency of the applied electric field exceeds a charge excitation gap. We argue that a pair‐hopping process yields a dynamical deformation of the orbital configuration.