论文标题
Spin-1 Kitaev-Heisenberg链中的量子相变
Quantum phase transitions in the spin-1 Kitaev-Heisenberg chain
论文作者
论文摘要
最近，有人提出，基塔夫相互作用的较高自旋类似物$ k> 0 $也可能发生在许多具有强烈的hund和旋转轨道耦合的材料中。在这项工作中，我们使用Lanczos对角度化和密度矩阵重质化组方法来数值研究$ s = 1 $ kitaev-heisenberg模型。通过采用局部和非局部自旋相关性研究地面相图和量子相变。我们确定了两个订购的阶段，以负heisenberg耦合$ j <0 $：A〜Ferromagnetic阶段，带有$ \ langle s_i^zs_ {i+1}^Z \ rangle> 0 $，以及一个Intermided左右左右左右，带有$ \ langle s_i^xss_^xs_ $ ne $ 1}。量子自旋液体在Kitaev限制附近稳定，而拓扑效果则以$ J> 0 $的形式找到。
Recently, it has been proposed that higher-spin analogues of the Kitaev interactions $K>0$ may also occur in a number of materials with strong Hund's and spin-orbit coupling. In this work, we use Lanczos diagonalization and density matrix renormalization group methods to investigate numerically the $S=1$ Kitaev-Heisenberg model. The ground-state phase diagram and quantum phase transitions are investigated by employing local and nonlocal spin correlations. We identified two ordered phases at negative Heisenberg coupling $J<0$: a~ferromagnetic phase with $\langle S_i^zS_{i+1}^z\rangle>0$ and an intermediate left-left-right-right phase with $\langle S_i^xS_{i+1}^x\rangle\neq 0$. A~quantum spin liquid is stable near the Kitaev limit, while a topological Haldane phase is found for $J>0$.
