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Monolayer Modification of VTe2 and Its Charge Density Wave
Paula Mariel Coelho1, Kinga Lasek1, Kien Nguyen Cong1
1Department of Physics, University of South Florida, Tampa, Florida 33620, United States.
The Journal of Physical Chemistry Letters
|August 15, 2019
Summary
The absence of interlayer coupling in VTe2 monolayers causes a structural shift, leading to a novel charge density wave (CDW) material. This transition is driven by electron transfer and impacts electronic properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Interlayer interactions significantly influence the electronic properties of layered transition metal dichalcogenides.
- Bulk and multilayer VTe2 exhibit a distorted 1T' structure.
Purpose of the Study:
- To investigate the structural and electronic properties of monolayer VTe2.
- To explore the impact of absent interlayer coupling on VTe2 structure and properties.
- To identify novel charge density wave (CDW) materials.
Main Methods:
- X-ray photoemission spectroscopy (XPS) to analyze electronic structure.
- Phonon-dispersion calculations to predict lattice instabilities.
- Low-temperature scanning tunneling microscopy (LT-STM) to observe structural distortions.
Main Results:
- Monolayer VTe2 adopts a hexagonal 1T structure, distinct from the bulk 1T' structure.
- Electron transfer from vanadium d bands to tellurium atoms observed in monolayer VTe2.
- The 1T structure exhibits imaginary phonon modes, indicating a charge density wave (CDW) instability.
- A 4 × 4 periodic lattice distortion, characteristic of CDW, was observed via LT-STM.
Conclusions:
- Interlayer coupling absence drives structural modification in VTe2, creating a novel CDW material.
- Electron transfer and reduced in-plane hybridization contribute to the stabilization of the 1T structure.
- The identified VTe2 CDW material offers tunable properties influenced by interlayer interactions.
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