论文标题
反铁磁金属的准经典理论
Quasiclassical theory for antiferromagnetic metals
论文作者
论文摘要
与铁磁性不同，由于磁矩方向存在快速空间变化，因此不能轻易地将抗铁磁性包括在准经典的Keldys理论中。准经典框架之所以有用，是因为它将与费米波长相当的长度尺度上的量子效应与其他长度尺度相媲美，并且已成功地用于研究涉及超导性和铁磁性的广泛现象。从紧密结合的哈密顿量开始，我们开发了一般的准经典运动和边界条件，可用于在肮脏极限中描述两种共同的金属反铁磁铁。边界条件也适用于可以补偿或无偿的自旋活性边界。此外，我们还显示了不均匀或动态磁纹理如何影响方程式，并在此框架内得出了可观察物的一般表达。
Unlike ferromagnetism, antiferromagnetism cannot readily be included in the quasiclassical Keldysh theory because of the rapid spatial variation in the directions of the magnetic moments. The quasiclassical framework is useful because it separates the quantum effects occurring at length scales comparable to the Fermi wavelength from other length scales, and has successfully been used to study a wide range of phenomena involving both superconductivity and ferromagnetism. Starting from a tight-binding Hamiltonian, we develop general quasiclassical equations of motion and boundary conditions, which can be used to describe two-sublattice metallic antiferromagnets in the dirty limit. The boundary conditions are applicable also for spin-active boundaries that can be either compensated or uncompensated. Additionally, we show how nonuniform or dynamic magnetic textures influence the equations and we derive a general expression for observables within this framework.
