スピントロニクスにおける量子コヒーレンス（理論）

在微波腔磁振子背景下自旋波的非线性已经完成，并在美因茨的SPICE研讨会（2018年）和埃尔兰根的Max-Planck Light（2018年）上向社区介绍了研究结果。相应的手稿是在其最后的迭代之间的作者M。Elyasi，Ya. M. Blanter和G. E. W.鲍尔，并很快被提交给一个高影响因子期刊。通过经典（解随机运动方程）和量子力学（解主方程）的分析和计算，揭示了强驱动腔光子-磁振子极化激元非线性相空间中的纠缠和非经典等定态特征.另一个平行方向考虑了自旋晶格中的非线性，给出了自旋晶格中自旋波模式（即孤子）在静态和动态两种情况下的完整分类。一个独特的观察到的功能是一个非线性引起的拓扑相位变化，从非平凡到平凡的孤子的功率增加。研究了这种相变的原因，并形成了该研究的重要部分，该研究发表为Phys. Rev. B 99，134402（2019）。

The nonlinearity of spin waves in the context of microwave cavity magnonic was finalized and the findings were presented to the community at SPICE workshop in Mainz (2018) and Max-Planck Light in Erlangen (2018). The corresponding manuscript is in its final iterations between the authors M. Elyasi, Ya. M. Blanter and G. E. W. Bauer, and is soon to be submitted to a high impact factor journal. The results map out the steady states features, such as entanglement and nonclassicality, in the nonlinear phase space of the strongly driven cavity photon-magnon polaritons, using classical (from solution of stochastic equations of motion) and quantum mechanical (from solution of master equations) analysis and computation. The findings pave the way for implementing spin waves in quantum information.The other parallel direction considering nonlinearities in a topologically nontrivial spin lattice equivalent of Haldane model for magnons, led to a complete classification of self-localized spin wave modes, i.e. solitons, in static and dynamic configurations of the lattice. A unique observed feature was a nonlinearity induced topological phase change from nontrivial to trivial by increasing the power of soliton. The reason for this phase change was investigated and formed an important part of the study, which was published as Phys. Rev. B 99, 134402 (2019).