# A comment on "The Computational 2D Materials Database: high-throughput modeling and discovery of atomically thin crystals"

## TL;DR

This paper critically examines the Computational 2D Materials Database (C2DB), highlighting fundamental flaws in its elasticity and stability assessments that undermine its reliability for 2D materials research.

## Contribution

It provides a critical analysis of the C2DB, identifying key issues in its mechanical stability and elasticity data, and discusses implications for future 2D materials studies.

## Key findings

- Identifies fundamental flaws in elasticity data
- Highlights unreliable mechanical stability tests
- Undermines confidence in C2DB's data for 2D materials

## Abstract

Recently, Sten Haastrup, Mikkel Strange, Mohnish Pandey, Thorsten Deilmann, Per S Schmidt, Nicki F Hinsche, Morten N Gjerding, Daniele Torelli, Peter M Larsen, Anders C Riis-Jensen, Jakob Gath, Karsten W Jacobsen, Jens Jrgen Mortensen, Thomas Olsen and Kristian S Thygesen [2D Mater. 5 (2018) 042002] introduced the Computational 2D Materials Database (C2DB), which organises a variety of structural, thermodynamic, elastic, electronic, magnetic, and optical properties of around 1500 two-dimensional materials distributed over more than 30 different crystal structures. Unfortunately, the work contains serious and fundamental flaws in the field of elasticity and mechanical stability tests what makes it unreliable.