通过库仑设计的长程相互作用控制1 TaS $_2$中的磁阻挫
Controlling magnetic frustration in 1T-TaS$_2$ via Coulomb engineered long-range interactions
摘要：
二维材料中的磁阻挫提供了一个丰富的操场，工程师的非常规现象，如非共线磁秩序和量子自旋液体的行为。然而，尽管付出了巨大的努力，在二维材料中实现可调阻挫磁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个通用的战略，以定制磁性基态的层状材料。使用近端量子自旋液体候选人1 T-TaS $_2$作为一个例子，我们展示了如何长程库仑相互作用重整化的低能量近平坦的能带结构，导致海森堡模型，决定性地依赖于库仑相互作用。在此基础上，我们表明，超交换耦合的材料可以精确地定制通过环境介电屏蔽，最终允许外部驱动的量子自旋液体制度的材料。我们的研究结果提出了库仑工程作为一个强大的工具来操纵范德华材料的磁性。
英文摘要：
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.
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