强旋轨耦合磁性离子的蜂巢（honeycomb）磁格子模型材料的设计合成与量子磁性研究

精准设计并实验合成出理论预测具有新奇现象或奇特异性的特定磁性物理模型材料是无机合成化学家以及凝聚态物理学家一直以来面临的挑战。近年来，自旋液体态由于可潜在应用于超能量子计算和量子通讯等而迅速成为研究前沿，然而目前还未在已合成材料中真正实现公认的自旋液体态。相比于三角格子、笼目（Kagomé）格子等自旋阻挫磁格子，更能实现自旋液体态并严格可解的Kitaev型蜂巢磁格子由于实验材料缺乏而研究较少。为了解决这一问题，本项目拟通过具有强自旋轨道耦合作用的4d、5d磁性离子与独特双-二齿成键环境的有机构筑基元进行链接，在实验上可控合成出新型蜂巢磁格子材料。同时利用多种异型链接原子的双-二齿有机构筑基元调节磁性离子八面体晶体场对称性和各向异性，以对新合成蜂巢磁格子材料的量子磁性进行有效调控。并期待利用有机构筑基元避免非Kitaev直接相互作用，最终在实验上实现Kitaev相互作用的自旋液体态。

Rational design and experimentally synthetic realization of specific magnetic lattices with theoretically-predicted novel phenomena and nontrivial properties is always a challenge for synthetic chemists and condensed matter physicists. Recently, spin liquid ground state rapidly becomes emergent research frontier owing to their potential applications for super quantum computation and quantum communication. However, spin liquid state has not yet been experimentally realized in already reported materials. Compared to geometrically-frustrated magnetic lattices of triangular and Kagomé, exactly solvable Kitaev’s honeycomb lattice for spin liquid state has less been investigated due to scarcity of experimental model materials. To solve this problem, this proposal aims to experimentally synthesize novel honeycomb lattices by constructing strongly spin-orbit coupled magnetic ions with bis-bidentate organic building units. Meanwhile, the quantum magnetism of newly-synthesized honeycomb lattices would be effectively modified by adjusting their crystal field symmetry and anisotropy using several bis-bidentate hetero-ligands of organic building units. Finally, Kitaev spin liquid state is expected to be experimentally realized after avoiding non Kitaev direct exchange interactions.