参量泵浦磁振子的无碰撞动力学理论
Collisionless kinetic theory for parametrically pumped magnons
摘要：
本文讨论了微波振荡场中磁振子非平衡动力学的无碰撞动力学方程。以前，这个问题已经被处理在所谓的"S-理论"，其中的碰撞积分的磁振子分布的动力学方程中被忽略或考虑到唯象通过一个有效的弛豫时间。然而，磁振子凝聚的可能性还没有被纳入S-理论。此外，出现在磁振子自能中的动量积分通常通过只保留圈动量等于外动量的项而解耦。在这项工作中，我们严格审查这些近似的准确性，并发展适当的扩展S-理论。我们表明，这些扩展可以显着修改的时间演化的磁振子分布。
英文摘要：
We discuss collisionless kinetic equations describing the non-equilibrium dynamics of magnons in a ferromagnet exposed to an oscillating microwave field. Previously, this problem has been treated within the so-called "S-theory" where the collision integral in the kinetic equation for the magnon distribution is either neglected or taken into account phenomenologically via an effective relaxation time. However, the possibility of magnon condensation has not been included in S-theory. Moreover, the momentum integrations appearing in the magnon self-energies are usually decoupled by retaining only the term where the loop momentum is equal to the external momentum. In this work we critically examine the accuracy of these approximations and develop the proper extensions of S-theory. We show that these extensions can significantly modify the time evolution of the magnon distribution.
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