Thermodynamics of magnon gases and Bose-Einstein condensation driven by pure spin currents

在本项目框架内，我们将详细研究纯自旋电流驱动下不同系统中磁振子气体的热力学特性和磁振子动力学。我们将考虑不同的方法来实现辐射磁振子冷却，调整磁振子色散谱，以及调整非线性磁振子-磁振子相互作用，以找到有效的机制，使人们能够保持磁振子气体的准平衡状态，并实现自旋电流驱动的玻色-爱因斯坦凝聚（BEC）。我们将研究电流感应BEC的时空相干特性和稳定性。我们还将讨论在现实空间中操纵凝析油的可能性。所提出的研究将有助于更深入地理解纯自旋电流与磁振子气体的相互作用，并有望为控制自旋电流诱导的动态现象开辟新的途径。

Within the framework of this project, we will study in detail the thermodynamic characteristics of magnon gases and magnon kinetics in different systems driven by pure spin currents. We will consider different approaches to the implementation of radiative magnon cooling, tailoring of the magnon dispersion spectrum, and tuning of the nonlinear magnon-magnon interactions to find efficient mechanisms allowing one to preserve the quasi-equilibrium state of the magnon gas and achieve spin current-driven Bose-Einstein condensation (BEC). We will study the spatial and temporal coherence characteristics and stability of the current-induced BEC. We will also address the possibilities of manipulation of condensates in the real space. The proposed investigations will contribute to the deeper understanding of interaction of pure spin currents with magnon gases and are expected to open novel approaches to the control of spin-current induced dynamic phenomena.