Powell B J, Kenny E P, Merino J
School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia.
Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid 28049, Spain.
Phys Rev Lett. 2017 Aug 25;119(8):087204. doi: 10.1103/PhysRevLett.119.087204.
We show that the anisotropy of the effective spin model for the dimer Mott insulator phase of κ-(BEDT-TTF)_{2}X salts is dramatically different from that of the underlying tight-binding model. Intradimer quantum interference results in a model of coupled spin chains, where frustrated interchain interactions suppress long-range magnetic order. Thus, we argue, the "spin liquid" phase observed in some of these materials is a remnant of the Tomonaga-Luttinger physics of a single chain. This is consistent with previous experiments and resolves some outstanding puzzles.
我们表明，κ-(BEDT-TTF)₂X盐二聚体莫特绝缘体相有效自旋模型的各向异性与基础紧束缚模型的各向异性显著不同。二聚体内量子干涉导致了一个耦合自旋链模型，其中受挫的链间相互作用抑制了长程磁序。因此，我们认为，在其中一些材料中观察到的“自旋液体”相是单链的汤川-卢廷格物理的残余。这与先前的实验一致，并解决了一些悬而未决的难题。
