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arXiv 1808.02138cond-mat.str-el
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相互作用费米子自旋选择激发空间斑图的形成

Formation of Spatial Patterns by Spin-selective Excitations of Interacting Fermions

Thomas Köhler, Sebastian Paeckel, Constantin Meyer, Salvatore R. Manmana

摘要:

我们描述了在微结构的存在下,相互作用的费米子系统的自旋选择性光激发引起的电荷和自旋密度图案的形成。作为一个例子,我们考虑了一个一维的Hubbard类系统的周期性的磁性微结构,它具有一个均匀的电荷分布在其基态,其中的长寿命的电荷密度图案是由自旋选择性光激发。使用张量网络方法,我们研究了电子-电子相互作用的存在下的全量子动力学,并确定了双光子作为诱导电荷模式的主要衰变通道。我们的设置相比,OISTR机制,其中超快的光学诱导的自旋转移在Heusler和磁性化合物与合金中的不同元素的局部态密度的差异。我们发现,应用自旋选择性激发有诱导空间周期性图案在本地观测。对相关材料的泵浦探测实验和超冷气体在光晶格上的实验的意义进行了讨论。

英文摘要:

We describe the formation of charge- and spin-density patterns induced by spin-selective photoexcitations of interacting fermionic systems in the presence of a microstructure. As an example, we consider a one-dimensional Hubbard-like system with a periodic magnetic microstructure, which has a uniform charge distribution in its ground state, and in which a long-lived charge-density pattern is induced by the spin-selective photoexcitation. Using tensor-network methods, we study the full quantum dynamics in the presence of electron-electron interactions and identify doublons as the main decay channel for the induced charge pattern. Our setup is compared to the OISTR mechanism, in which ultrafast optically induced spin transfer in Heusler and magnetic compounds is associated to the difference of the local density of states of the different elements in the alloys. We find that applying a spin-selective excitation there induces spatially periodic patterns in local observables. Implications for pump-probe experiments on correlated materials and experiments with ultracold gases on optical lattices are discussed.

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