用原子吸附剂区分莫特绝缘体和普通绝缘体
Distinguishing a Mott Insulator from a Trivial Insulator with Atomic Adsorbates
摘要：
在各种相互作用交织在一起的电子系统中，揭示其多体基态的起源是具有挑战性的，并且缺乏直接的实验方法来验证绝缘体的相关性质。在这里，我们展示了一种方法来明确区分一个典型的相关绝缘体，一个莫特绝缘体，从一个平凡的带状绝缘体的基础上，他们不同的化学行为的表面吸附使用1 T-TaS 2，这一直是一个自旋受抑的莫特绝缘体或自旋单线平凡绝缘体之间的争论。我们从观察不同的表面终端上的不同大小的光谱间隙，并表明，这两个表面层上的钾吸附原子的行为完全不同的方式。这可以从莫特绝缘体和带状绝缘体的不同性质中直接理解，因为它们分别涉及半满轨道和满满轨道的基本差异。这项工作不仅解决了这一特别有趣的材料中的一个突出问题，而且提供了一个简单的试金石，以确定相关的基态的电子实验。
英文摘要：
In an electronic system with various interactions intertwined, revealing the origin of its many-body ground state is challenging and a direct experimental way to verify the correlated nature of an insulator has been lacking. Here we demonstrate a way to unambiguously distinguish a paradigmatic correlated insulator, a Mott insulator, from a trivial band insulator based on their distinct chemical behavior for a surface adsorbate using 1T-TaS2, which has been debated between a spin-frustrated Mott insulator or a spin-singlet trivial insulator. We start from the observation of different sizes of spectral gaps on different surface terminations and show that potassium adatoms on these two surface layers behave in totally different ways. This can be straightforwardly understood from distinct properties of a Mott and a band insulators due to the fundamental difference of a half and a full-filled orbital involved respectively. This work not only solves an outstanding problem in this particularly interesting material but also provides a simple touchstone to identify the correlated ground state of electrons experimentally.
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