Magnetic fluctuations and nematic order in iron-based superconductors: Stability, short-time dynamics, transport and orbital correlations

我们的总体目标是更好地理解电子相关在铁基超导体中的作用。证明了有效的单粒子理论能够成功地预测铁粒子带结构的主要特征。然而，越来越明显的是，这些系统中的多体效应很强。也许，最突出的例子是观察到电子驱动的向列性在各种实验探针支持的铁- nictides的母体化合物。在这个建议中，我们的目标是发展向列序和相关的强磁弹性耦合的微观描述。此外，我们将开发用于探测向列性的许多重要实验的理论框架：弹性性质，核磁共振自旋晶格弛豫率，电阻率，霍尔效应和热功率各向异性，以及超快光学实验。

Our overall goal is to better understand the role of electronic correlations in the iron-based superconductors. It is established that effective one-particle theories are successful in predicting the main features of the band structure of the Fe-pnictides. Nevertheless, it becomes increasingly evident that the many-body effects are strong in these systems. Perhaps, the most prominent example of it is an observation of electronically driven nematicity in the parent compounds of ferro-pnictides supported by various experimental probes. In this proposal we aim at developing a microscopic description of nematic order and the associated strong magnetoelastic coupling. In addition we will develop the theoretical framework for a number of important experiments that are being used to probe nematicity: elastic properties, NMR spin lattice relaxation rate, the resistivity, Hall effect and thermopower anisotropy, and ultrafast optics experiments.