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Research Article

Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2

Meizhuang Liu§, Changwei Wu§, Zizhao Liu, Zhiqiang Wang, Dao-Xin Yao( ), Dingyong Zhong( )
School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China

§ Meizhuang Liu and Changwei Wu contributed equally to this work.

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Abstract

Vanadium dichalcogenides have attracted increasing interests for the charge density wave phenomena and possible ferromagnetism. Here, we report on the multiphase behavior and gap opening in monolayer VTe2 grown by molecular beam epitaxy. Scanning tunneling microscopy (STM) and spectroscopy study revealed the (4×4) metallic and gapped (2 3 ×2 3 ) charge-density wave (CDW) phases with an energy gap of ~ 40 meV. Through the in-plane condensation of vanadium atoms, the typical star-of-David clusters and truncated triangle-shaped clusters are formed in the (4×4) and (2 3 ×2 3 ) phases respectively, resulting in different surface morphologies and electronic structures as confirmed by density functional theory (DFT) calculations with on-site Coulomb repulsion. The CDW-driven reorganization of the atomic structure weakens the ferromagnetic superexchange coupling and strengthens the antiferromagnetic exchange coupling on the contrary, suppressing the long-range magnetic order in monolayer VTe2. The electron correlation is found to be important to explain the gap opening in the (2 3 ×2 3 ) phase.

Keywords

transition-metal dichalcogenidescharge density wave1T-VTe2scanning tunneling microscopy

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Nano Research
Volume 13 Issue 6,
June 2020
Pages 1733-1738
DOI: 10.1007/s12274-020-2799-4
Cite this article:
Liu M, Wu C, Liu Z, et al. Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2. Nano Research, 2020, 13(6): 1733-1738. https://doi.org/10.1007/s12274-020-2799-4
Topics:
Density functional theoryElectronic structureFerromagnetismMonolayersScanning tunneling microscopyTellurium compoundsVanadium

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Received: 23 December 2019
Revised: 23 March 2020
Accepted: 07 April 2020
Published: 24 April 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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