论文标题
莫伊尔（Moiré）
Gate-tunable heavy fermions in a moiré Kondo lattice
论文作者
论文摘要
近托晶格描述了通过自旋交换相互作用与流动传导电子结合的局部磁矩的矩阵，是密切相关的量子物质的原型。传统上，近代晶格是在含有灯笼或肌动剂的金属间化合物中实现的。这些大量材料中电子密度和交换相互作用的复杂电子结构和有限的可调性构成了研究近代晶格物理的重大挑战。在这里，我们报告了在AB堆叠的Mote2/WSE2MoiréBiLayers中实现合成的近托晶格，其中Mote2层调谐到Mott隔热状态，支撑当地矩的三角形Moiré晶格，WSE2层与我们的WSE2层与行动式导载载体相掺杂。我们观察到沉重的费米子，在围绕温度以下的费米表面很大。我们还通过外部磁场观察到沉重的费米子破坏，而费米表面尺寸和准粒子质量突然降低。我们进一步通过巡回携带者密度或临界相互作用来广泛，连续地表现出可调栅极可调的近藤温度。我们的研究开放了基于半导体Moiré材料，在单个设备中使用异国情调量子关键的近代晶格的丰富相图的可能性
The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated quantum matter. Traditionally, Kondo lattices are realized in intermetallic compounds containing lanthanide or actinide. The complex electronic structure and limited tunability of both the electron density and exchange interactions in these bulk materials pose significant challenges to study Kondo lattice physics. Here, we report the realization of a synthetic Kondo lattice in AB-stacked MoTe2/WSe2 moiré bilayers, where the MoTe2 layer is tuned to a Mott insulating state, supporting a triangular moiré lattice of local moments, and the WSe2 layer is doped with itinerant conduction carriers. We observe heavy fermions with a large Fermi surface below the Kondo temperature. We also observe destruction of the heavy fermions by an external magnetic field with an abrupt decrease of the Fermi surface size and quasiparticle mass. We further demonstrate widely and continuously gate-tunable Kondo temperatures through either the itinerant carrier density or Kondo interaction. Our study opens the possibility of in-situ access to the rich phase diagram of the Kondo lattice with exotic quantum criticalities in a single device based on semiconductor moiré materials
