Topological magnons and novel low-energy excitations in helimagnets.

我们新项目的目的是利用中子散射对一些螺旋磁性材料中揭示的新型磁激发进行深入研究。特别是，我们想追求的伪戈德斯通模式的对称helimagnets和拓扑magnonic Weyl态的Dzyaloshinskiii-Moriya相互作用系统的调查。我们还将扩展我们的研究巡回helimagnets，专注于helimagnon激发铁掺杂MnSi和自旋波系统与MnP型结构，实现了双螺旋型的磁秩序。我们将使用这些结果来开发磁激发谱的理论模型，并根据其低能自旋动力学来预测或解释helmagnetic材料的热力学和输运性质。

The aim of our new project is to perform an in-depth study of the new types of magnetic excitations revealed in a number of helimagnetic materials using neutron scattering. In particular, we would like to pursue the investigation of pseudo-Goldstone modes in symmetric helimagnets and topological magnonic Weyl states in systems with Dzyaloshinskii-Moriya interactions. We will also extend our study to itinerant helimagnets, focusing on helimagnon excitations in Fe-doped MnSi and on spin waves in systems with MnP-type structure that realize a double-helix type of magnetic order. We will use the results to develop theoretical models of the magnetic excitation spectrum and to predict or explain thermodynamic and transport properties of helimagnetic materials based on their low-energy spin dynamics.