Intertwined electronic and magnetic structure of the van-der-Waals antiferromagnet Fe2P2S6

Many unusual and promising properties have been reported recently for the transition metal trichalcogenides of the type MPS3 (M = V, Mn, Fe, Ni..), such as maintaining magnetic order to the atomically thin limit, ultra-sharp many-body excitons, metal-insulator transitions and, especially for Fe2P2S6, giant linear dichroism among others. Here we conduct a detailed investigation of the electronic structure of Fe2P2S6 using angle-resolved photoemission spectroscopy, q-dependent electron energy loss spectroscopy, optical spectroscopies and density functional theory. Fe2P2S6 is a Mott insulator with a gap of E gap ≈ 1.4 eV and zigzag antiferromagnetism below T N = 119 K. The low energy excitations are dominated by Fe 3d states. Large and sign-changing linear dichroism is observed. We provide a microscopic mechanism explaining key properties of the linear dichroism based on the correlated character of the electronic structure, thereby elucidating the nature of the spin-charge coupling in Fe2P2S6 and related materials

Implementation of an urban operations simulation model

The implementation of a basic simulation framework for urban operation scenarios, using the discrete event simulation tool IMPRINT, is presented. Preliminary stages of problem definition, system analysis and modeling are described. The model consists of task nodes representing essential processes in urban operations (e.g., room clearing) that are controlled and coordinated by a platoon leader. In the basic framework, the architecture and size of the urban task environment and the platoon size are used as independent variables. For exemplary purposes, the model has been parameterized in terms of task duration, based on small samples from field observation. In prospective studies, the framework will be extended by independent variables such as forces' gear, experience and team structure and by dependent variables based on a database for human performance and workload parameters