Theory of thermally driven spin-transport in spin-orbit coupled systems

我们提出了一个协调的研究计划，研究自旋相关的输运（准粒子自旋和电荷电流）和热梯度驱动的磁激发（磁振子）及其相关的非平衡声子。我们的重点将是混合系统（包含磁性和非磁性组件）和具有自旋轨道耦合的异质结构器件（隧道器件）。我们将把理论上的单粒子效应、集体效应和相对论效应结合起来，i)建立对横向自旋塞贝克效应物理学更好的微观理解；ii)探索各向异性隧道磁塞贝克效应等新型各向异性磁热输运现象的可能性；iii)研究无序、非弹性过程和大热梯度效应（探索线性响应的极限）对横向（类霍尔）自旋电流和磁力矩在大温度范围内（包括室温）响应热梯度产生的相互作用。为了充分阐明这些物理现象并建立自信的预测能力，我们将利用并结合多种互补的理论方法和方法，其中一些将与SPP的其他团队合作。

We propose a coordinated research program on the study of spin-dependent transport (quasi-particle spin and charge currents) and magnetic excitations (magnons) driven by thermal gradients and their associated non-equilibrium phonons. Our focus will be on hybrid systems (containing magnetic and non-magnetic components) and hetero-structure devices (tunneling devices) with spin-orbit coupling. We will combine theoretically single-particle, collective, and relativistic effects to i) establish a better microscopic understanding of the physics of transverse spin Seebeck effect; ii) explore the possibility of novel anisotropic magneto-thermal transport phenomena such as Anisotropic Tunneling Magneto-Seebeck effect; and iii) study the interaction of disorder, inelastic processes, and large thermal gradient effects (exploring the limits of linear response) on the transverse (Hall like) spin-currents and magnetic torques generated in response to thermal gradients at a large range of temperatures, including room temperature. To fully elucidate these physics and build confident predictive power, we will utilize and combine multiple complementary theory methodologies and approaches, some in collaboration with other teams in the SPP.