论文标题
通过库仑工程长期互动来控制1T-TAS $ _2 $中的磁性挫败感
Controlling magnetic frustration in 1T-TaS$_2$ via Coulomb engineered long-range interactions
论文作者
论文摘要
二维材料中的磁性挫败感为工程师非常规现象提供了丰富的游乐场，例如非连续性磁性和量子自旋液体行为。然而，尽管付出了巨大的努力，但在二维材料中实现了可调的挫败磁顺序仍然是一个开放的挑战。在这里，我们提出库仑工程作为一种多功能策略，以在分层材料中量身定制磁接地状态。以近端量子自旋式候选候选1T-TAS $ _2 $为例，我们显示了多长时间的库仑相互作用，使低能近似平坦的频带结构重新归一致，从而导致了Heisenberg模型，从而决定性地取决于库仑的相互作用。基于此，我们表明材料中的甲基旋转耦合可以通过环境介电筛选精确地量身定制，最终使材料向外部驱动材料朝量子旋转液体方向驱动。我们的结果提出了库仑工程作为操纵范德华材料的磁性特性的强大工具。
Magnetic frustrations in two-dimensional materials provide a rich playground to engineer unconventional phenomena such as non-collinear magnetic order and quantum spin-liquid behavior. However, despite intense efforts, a realization of tunable frustrated magnetic order in two-dimensional materials remains an open challenge. Here we propose Coulomb engineering as a versatile strategy to tailor magnetic ground states in layered materials. Using the proximal quantum spin-liquid candidate 1T-TaS$_2$ as an example, we show how long-range Coulomb interactions renormalize the low energy nearly flat band structure, leading to a Heisenberg model which decisively depends on the Coulomb interactions. Based on this, we show that superexchange couplings in the material can be precisely tailored by means of environmental dielectric screening, ultimately allowing to externally drive the material towards the quantum spin-liquid regime. Our results put forward Coulomb engineering as a powerful tool to manipulate magnetic properties of van der Waals materials.
