论文标题
观察大量1T键$ _2 $晶体表面的多种相关状态
Observation of a multitude of correlated states at the surface of bulk 1T-TaSe$_2$ crystals
论文作者
论文摘要
电子电子相互作用与结构排序之间的相互作用可以产生异常丰富的相关电子相。我们已经使用扫描隧道显微镜研究了大量的1T-Tase2，并发现了其令人惊讶的多样化的相关表面状态。这些表面状态表现出相同的平面内电荷密度波排序，但从绝缘到金属的电子接地状态截然不同。绝缘的表面状态显示了脱钩的表面莫特层的特征。另一方面，金属表面状态表现出不同强度的零偏置峰，这表明莫特表面层与金属块之间的耦合产生的近托相。因此，散装1T-Tase2的表面构成了涵盖广泛参数的周期性模型的罕见实现，从而提供了一个模型系统，用于访问同一晶体中的不同相关现象。我们的结果突出了该材料家族中强相关性的核心作用。
The interplay between electron-electron interactions and structural ordering can yield exceptionally rich correlated electronic phases. We have used scanning tunneling microscopy to investigate bulk 1T-TaSe2 and have uncovered surprisingly diverse correlated surface states thereof. These surface states exhibit the same in-plane charge density wave ordering but dramatically different electronic ground states ranging from insulating to metallic. The insulating variety of surface state shows signatures of a decoupled surface Mott layer. The metallic surface states, on the other hand, exhibit zero-bias peaks of varying strength that suggest Kondo phases arising from coupling between the Mott surface layer and the metallic bulk of 1T-TaSe2. The surface of bulk 1T-TaSe2 thus constitutes a rare realization of the periodic Anderson model covering a wide parameter regime, thereby providing a model system for accessing different correlated phenomena in the same crystal. Our results highlight the central role played by strong correlations in this material family.
