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Janus Monolayer of 1T-TaSSe: A Computational Study.
1Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Lodz, Ulica Pomorska 149/153, 90-236 Lodz, Poland.
This study computationally investigates Janus 1T-TaSSe monolayers, revealing a novel platform for charge density waves (CDWs). The research explores structural and electronic properties, comparing them to parent compounds like TaS2 and TaSe2.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Charge density waves (CDWs) are complex electronic phenomena in materials.
- Transition metal dichalcogenides (TMDs) are known for CDW properties.
- Janus monolayers offer unique structural and electronic characteristics.
Purpose of the Study:
- To computationally study the Janus monolayer of 1T-TaSSe transition metal dichalcogenide.
- To investigate the structural and electronic properties of both normal and distorted phases.
- To compare the CDW behavior with parent compounds (TaS2 and TaSe2).
Main Methods:
- First principles-based computational study.
- Analysis of structural and electronic properties.
- Investigation of phonon modes and band structures.
Main Results:
- Demonstrated emergence of dipolar moment in the normal phase due to symmetry breaking.
- Showed sensitivity of the dipolar moment to an external electric field.
- Identified imaginary phonon modes indicating structural instability.
- Predicted a flat, weakly dispersive band in the distorted phase, characteristic of CDWs.
Conclusions:
- Janus 1T-TaSSe monolayers exhibit properties conducive to charge density waves.
- The material presents a novel platform for studying CDWs in 2D TMDs.
- The findings contribute to understanding complex electronic phases in low-dimensional materials.
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