论文标题
时间分辨的光发射和RIXS研究现场选择性Mott绝缘子
Time-resolved photoemission and RIXS study of a site-selective Mott insulator
论文作者
论文摘要
受稀土镍物理学的启发，我们研究了相关电子系统的光发射（PES）和共振非弹性X射线散射（RIXS）光谱，并具有两种绝缘均匀的sublattices。 Sublattice A的特征是杂交间隙和低旋转状态，而Sublattice B具有Mott GAP和局部磁矩。我们展示了这两个定性不同的绝缘状态的耦合如何影响光诱导的电荷载体的动力学以及非平衡状态如何在PES和RIXS信号中表现出来。特别是，我们发现在B sublatice上创建的电荷载体迁移到A Sublatice，在那里它们有助于在PES信号中创建间隙状态，并在非平衡RIX频谱中的特征峰。虽然在本地光发射频谱中无法轻易区分两个sublattices的贡献，但在二维$ω__\ text {in} $ - $ - $ω_\ text {out} $中，RIXS信号的权重提供了两个Sublattices的局部状态进化信息。
Inspired by the physics of rare earth nickelates, we study the photoemission (PES) and resonant inelastic X-ray scattering (RIXS) spectra of a correlated electron system with two types of insulating sublattices. Sublattice A is characterized by a hybridization gap and a low-spin state, while sublattice B features a Mott gap and a local magnetic moment. We show how the coupling of these two qualitatively different insulating states affects the dynamics of photo-induced charge carriers and how the nonequilibrium states manifest themselves in the PES and RIXS signals. In particular, we find that charge carriers created on the B sublattice migrate to the A sublattice, where they contribute to the creation of in-gap states in the PES signal, and to characteristic peaks in the nonequilibrium RIXS spectrum. While the contributions from the two sublattices cannot be easily distinguished in the local photoemission spectrum, the weights of the RIXS signals in the two-dimensional $ω_\text{in}$-$ω_\text{out}$ space provide information on the local state evolution on both sublattices.
