# Vibrational and dielectric properties of monolayer transition metal dichalcogenides

## TL;DR

This study employs a unified first-principles approach to analyze vibrational and dielectric properties across the entire family of monolayer transition metal dichalcogenides, revealing new relationships and trends that aid in device design.

## Contribution

It provides a comprehensive, systematic analysis of multiple physical properties of monolayer transition metal dichalcogenides using a single methodology, highlighting inter-property relationships and effects of symmetry and composition.

## Key findings

- Identified new relationships between physical properties of monolayer TMDs.
- Observed strong interlayer effects in triclinic compounds.
- Revealed trends useful for designing materials with specific functionalities.

## Abstract

First-principles studies of two-dimensional transition metal dichalcogenides have contributed considerably to the understanding of their dielectric, optical, elastic, and vibrational properties. The majority of works to date focus on a single material or physical property. Here we use a single first-principles methodology on the whole family of systems, to investigate in depth the relationships between different physical properties, the underlying symmetry and the composition of these materials, and observe trends. We compare to bulk counterparts to show strong interlayer effects in triclinic compounds. Previously unobserved relationships between these monolayer compounds become apparent. These trends can then be exploited by the materials science, nanoscience, and chemistry communities to better design devices and heterostructures for specific functionalities.