着色三角MoTe2单层中的电子Janus晶格和类Kagome能带
Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers
AI总结：
本研究通过分子束外延在MoTe2单层中引入镜像孪晶界构建着色三角晶格，发现其具有电子Janus晶格和类狄拉克及平坦能带，并验证了其作为能量可调电子隧穿势垒的潜力。
摘要：
过渡金属二硫属化物（TMDs）的多态结构承载着奇异的电子态，如电荷密度波和超导电性。然而，这些结构的数量受晶体对称性限制，这给在理论和实验上实现定制晶格和性质带来了挑战。在此，我们报道了一种着色三角（CT）晶格的MoTe2单层，称为CT-MoTe2，通过在分子束外延中可控地将均匀且有序的镜像孪晶界引入原始单层而构建。低温扫描隧道显微镜和谱学（STM/STS）结合理论计算揭示，该单层具有电子Janus晶格，即一个能量依赖的原子晶格和一个赝Te亚晶格，并与Mo5Te8层具有相同的几何结构。CT晶格中固有存在的类狄拉克和平坦电子带分别通过STS谱中的两个宽峰和两个显著峰被识别，并通过密度泛函理论计算得到验证。观察到两种类型的内禀畴界，其中一种保持了电子Janus晶格特征，暗示其作为未来功能器件中能量可调电子隧穿势垒的潜在应用。
英文摘要：
Polymorphic structures of transition-metal dichalcogenides (TMDs) host exotic electronic states, like charge density wave and superconductivity. However, the number of these structures is limited by crystal symmetries, which poses a challenge to achieve tailored lattices and properties both theoretically and experimentally. Here, we report a coloring-triangle (CT) latticed MoTe2 monolayer, termed CT-MoTe2, constructed by controllably introducing uniform and ordered mirror-twin-boundaries into a pristine monolayer in molecular beam epitaxy. Low-temperature scanning tunneling microscopy and spectroscopy (STM/STS) together with theoretical calculations reveal that the monolayer has an electronic Janus lattice, i.e., an energy-dependent atomic-lattice and a pseudo-Te sublattice, and shares the identical geometry with the Mo5Te8 layer. Dirac-like and flat electronic bands inherently existing in the CT lattice are identified by two broad and two prominent peaks in STS spectra, respectively, and verified with density-functional-theory calculations. Two types of intrinsic domain boundaries were observed, in one of which the electronic-Janus-lattice feature maintains, implying potential applications as an energy-tunable electron-tunneling barrier in future functional devices.
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