Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers

Le Lei, Jiaqi Dai, Haoyu Dong, Yanyan Geng, Feiyue Cao, Cong Wang, Rui Xu, Fei Pang, Zheng-Xin Liu, Fangsen Li, Zhihai Cheng (), Guang Wang () and Wei Ji ()
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Le Lei: Renmin University of China
Jiaqi Dai: Renmin University of China
Haoyu Dong: Renmin University of China
Yanyan Geng: Renmin University of China
Feiyue Cao: Renmin University of China
Cong Wang: Renmin University of China
Rui Xu: Renmin University of China
Fei Pang: Renmin University of China
Zheng-Xin Liu: Renmin University of China
Fangsen Li: Chinese Academy of Sciences
Zhihai Cheng: Renmin University of China
Guang Wang: National University of Defense Technology
Wei Ji: Renmin University of China

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract 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 achieving 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 via 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 Te pseudo-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, one of which maintains the electronic-Janus-lattice feature, implying potential applications as an energy-tunable electron-tunneling barrier in future functional devices.

Date: 2023
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DOI: 10.1038/s41467-023-42044-5

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