Study of topological order and detection of edge statein the spin liquid state realized in an organic material

本文证实了有机三角晶格体系EtMe_3Sb[Pd（dmit）_2]_2具有自旋液体基态，但没有反铁磁有序。自旋-晶格弛豫速率的温度依赖性表明，该系统的自旋状态经历了一个突变，在约1 K。虽然有些理论预言这种不稳定性伴随着拓扑有序，但我得出结论，拓扑有序不可能在这个系统中实现，我还阐明了当这种自旋液体状态通过取代抗衡阳离子或施加压力而被破坏时出现的电子状态。

I have confirmed that the organic triangular-lattice system EtMe_3Sb[Pd(dmit)_2]_2 has an spin-liquid ground state without antiferromagnetic ordering. The temperature dependence of the spin-lattice relaxation rate suggests that the spin state of this system undergoes an abrupt change at around 1 K. Although some theories had predicted that such an instability is accompanied by topological ordering, I have reached a conclusion that topological ordering is not likely to be realized in this system.I have also clarified the electronic states which appear when this spin liquid state is destroyed by substituting the counter cation or applying pressure.