El Hog Sahbi, Diep H T, Puszkarski Henryk
Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, CNRS, UMR 8089, 2, Avenue Adolphe Chauvin, 95302 Cergy-Pontoise Cedex, France.
J Phys Condens Matter. 2017 Aug 2;29(30):305001. doi: 10.1088/1361-648X/aa75a4. Epub 2017 May 30.
We study in this paper magnetic properties of a system of quantum Heisenberg spins interacting with each other via a ferromagnetic exchange interaction J and an in-plane Dzyaloshinskii-Moriya interaction D. The non-collinear ground state due to the competition between J and D is determined. We employ a self-consistent Green'function theory to calculate the spin-wave spectrum and the layer magnetizations at finite T in two and three dimensions as well as in a thin film with surface effects. Analytical details and the validity of the method are shown and discussed. Numerical solutions are shown for realistic physical interaction parameters. Discussion on possible experimental verifications is given.
我们在本文中研究了一个量子海森堡自旋系统的磁性质，该系统通过铁磁交换相互作用J和面内的Dzyaloshinskii-Moriya相互作用D相互作用。确定了由于J和D之间的竞争导致的非共线基态。我们采用自洽格林函数理论来计算二维、三维以及具有表面效应的薄膜在有限温度T下的自旋波谱和层磁化强度。展示并讨论了该方法的分析细节和有效性。给出了针对实际物理相互作用参数的数值解。还给出了关于可能的实验验证的讨论。
