Essafi Karim, Benton Owen, Jaubert L D C
Okinawa Inst Sci &Technol, Onna, Okinawa 904 0495, Japan.
Nat Commun. 2016 Jan 22;7:10297. doi: 10.1038/ncomms10297.
Despite its deceptive simplicity, few concepts have more fundamental implications than chirality, from the therapeutic activity of drugs to the fundamental forces of nature. In magnetic materials, chirality gives rise to unconventional phenomena such as the anomalous Hall effect and multiferroicity, taking an enhanced flavour in the so-called spin-liquid phases where magnetic disorder prevails. Kagome systems sit at the crossroad of these ideas. Motivated by the recent synthesis of rare-earth kagome materials and the progresses in optical-lattice experiments, we bring together an entire network of spin liquids with anisotropic and Dzyaloshinskii-Moriya interactions. This network revolves around the Ising antiferromagnet and ends on (ferromagnetic) chiral spin liquids with spontaneously broken time-reversal symmetry. As for the celebrated Heisenberg antiferromagnet, it now belongs to a triad of equivalently disordered phases. The present work provides a unifying theory of kagome spin liquids with time-reversal invariant nearest-neighbour Hamiltonians.
尽管手性看似简单,但其概念的基础意义在从药物治疗活性到自然基本力等诸多方面都极为重要。在磁性材料中,手性会引发诸如反常霍尔效应和多铁性等非常规现象,在磁无序占主导的所谓自旋液体相中表现得更为突出。 Kagome 体系处于这些概念的交叉点。受近期稀土 Kagome 材料合成以及光晶格实验进展的推动,我们构建了一个包含具有各向异性和 Dzyaloshinskii - Moriya 相互作用的自旋液体的完整网络。这个网络围绕伊辛反铁磁体展开,并以具有自发破缺时间反演对称性的(铁磁)手性自旋液体为终点。至于著名的海森堡反铁磁体,它现在属于一组等效无序相。本工作为具有时间反演不变最近邻哈密顿量的 Kagome 自旋液体提供了一个统一理论。