论文标题
蜂窝氧化物异质结构：Kitaev量子旋转液体的新平台
Honeycomb oxide heterostructure: a new platform for Kitaev quantum spin liquid
论文作者
论文摘要
基塔夫量子旋转液体（巨大的量子纠缠状态）本质上是如此稀缺，以至于寻找新的候选系统仍然是一个巨大的挑战。蜂窝异质结构可能是通过分别提供哈密顿和装置兼容性的额外可控性来实现和利用这种异国量子相的有前途的途径。在这里，我们提供外延蜂窝氧化物薄膜Na3Co2SBO6，这是最近提出的Kitaev量子自旋液体的候选者。我们发现自旋玻璃和抗铁磁基态取决于NA化学计量学，这不仅意味着NA空位控制的重要性，而且还表示Na3Co2SBO6的强烈挫败感。尽管具有经典的基础状态，但依赖于场的磁化率显示出与单个临界指数的显着缩放崩溃，可以将其解释为量子关键性的证据。它的电子基态和来自光谱的自旋汉密尔顿人与预测的基塔伊夫模型一致。我们的工作为实现和利用Kitaev量子旋转液体提供了独特的途径。
Kitaev quantum spin liquid, massively quantum entangled states, is so scarce in nature that searching for new candidate systems remains a great challenge. Honeycomb heterostructure could be a promising route to realize and utilize such an exotic quantum phase by providing additional controllability of Hamiltonian and device compatibility, respectively. Here, we provide epitaxial honeycomb oxide thin film Na3Co2SbO6, a candidate of Kitaev quantum spin liquid proposed recently. We found a spin glass and antiferromagnetic ground states depending on Na stoichiometry, signifying not only the importance of Na vacancy control but also strong frustration in Na3Co2SbO6. Despite its classical ground state, the field-dependent magnetic susceptibility shows remarkable scaling collapse with a single critical exponent, which can be interpreted as evidence of quantum criticality. Its electronic ground state and derived spin Hamiltonian from spectroscopies are consistent with the predicted Kitaev model. Our work provides a unique route to the realization and utilization of Kitaev quantum spin liquid.
