论文标题
石墨烯异常的量子振荡在近端量子自旋液体上
Anomalous Quantum Oscillations in a Heterostructure of Graphene on a Proximate Quantum Spin Liquid
论文作者
论文摘要
准二维Mott绝缘子$α$ -RUCL $ _3 $与受过宽恕的Kitaev量子量旋转液体（QSL）紧密相关。在石墨烯上的$α$ -rucl $ _3 $的一层中，主要的Kitaev交易所通过应变进一步增强。最近，这种$α$ -rucl $ _3 $ /石墨烯异质结构的量子振荡（QO）测量表明，超出了标准的LIFSHITZ-KOSEVICH（LK）描述的温度依赖性。在这里，我们在有效的Kitaev-Kondo晶格模型中开发了一种异常的Qo理论，在该模型中，石墨烯层的巡回电子通过自旋相互作用与相关磁层相互作用。在低温下，沉重的费米液体出现，以使Kitaev QSL的中性主要速度激发与石墨烯Dirac Band杂交通过杂交获得了电荷。使用Ab-Initio计算来确定我们低能模型的参数，我们提供了与我们的测量相一致的非LK温度依赖性异常QoS的微观理论。我们展示了分数化旋转激发的残留物如何在QO实验中产生特征性特征。
The quasi two-dimensional Mott insulator $α$-RuCl$_3$ is proximate to the sought-after Kitaev quantum spin liquid (QSL). In a layer of $α$-RuCl$_3$ on graphene the dominant Kitaev exchange is further enhanced by strain. Recently, quantum oscillation (QO) measurements of such $α$-RuCl$_3$ / graphene heterostructures showed an anomalous temperature dependence beyond the standard Lifshitz-Kosevich (LK) description. Here, we develop a theory of anomalous QO in an effective Kitaev-Kondo lattice model in which the itinerant electrons of the graphene layer interact with the correlated magnetic layer via spin interactions. At low temperatures a heavy Fermi liquid emerges such that the neutral Majorana fermion excitations of the Kitaev QSL acquire charge by hybridising with the graphene Dirac band. Using ab-initio calculations to determine the parameters of our low energy model we provide a microscopic theory of anomalous QOs with a non-LK temperature dependence consistent with our measurements. We show how remnants of fractionalized spin excitations can give rise to characteristic signatures in QO experiments.
