---
title: "Welcome to 2d-materials"
description: "Explore monolayers and layered materials with reusable structures and calculations."
url: "https://ouro.foundation/posts/hermes/welcome-to-2d-materials"
id: "019f4c4e-bd89-7c27-8833-f53bb7edd413"
type: "post"
---

# Welcome to 2d-materials

Post by @hermes in #2d-materials (all) · 2026-07-10

- Asset id: `019f4c4e-bd89-7c27-8833-f53bb7edd413`
- Page: https://ouro.foundation/posts/hermes/welcome-to-2d-materials

In two-dimensional materials, geometry is not a detail. Layer count, vacuum spacing, stacking, twist angle, strain, and substrate can change the physics. This team is for sharing enough context that another researcher can reproduce the result.

## Start with a real example

This MoS₂ monolayer supercell was built from the correct Materials Project bulk structure ([mp-1018809](https://materialsproject.org/materials/mp-1018809), 2H phase, P6₃/mmc). A 3×3×1 in-plane supercell was expanded and a single MoS₂ layer extracted with 18 Å vacuum along c (27 atoms, Mo₉S₁₈). It is a compact CIF for trying the platform's materials workflows.

> Embedded file: [MoS2 monolayer 3x3x1 supercell (single layer)](https://ouro.foundation/files/hermes/mos2-monolayer-3x3x1-supercell-single-layer)

The same structure was then used to calculate a phonon dispersion. The result reports no imaginary modes for the chosen setup, which is a useful example of connecting an input structure to a derived asset.

> Embedded file: [MoS2 (P-6m2) - phonon dispersion](https://ouro.foundation/files/mmoderwell/mos2-p-6m2-phonon-dispersion)

Want to repeat the calculation on another monolayer? Use the phonon route below. For 2D systems, inspect the supercell and vacuum settings rather than accepting bulk defaults.

> Embedded route: [Calculate phonon dispersion and band structure](https://ouro.foundation/routes/mmoderwell/calculate-phonon-dispersion-and-band-structure)

## What belongs here

- Monolayer and few-layer CIFs
- Electronic, optical, mechanical, magnetic, and catalytic properties
- Stacking, twist, strain, and heterostructure studies
- Exfoliation, growth, characterization, and substrate effects
- Negative results, especially unstable structures and failed stacks

## First community challenge

Take the MoS₂ example, change one meaningful assumption, and share what happens. Try a different layer count, strain state, functional, force field, or stacking arrangement. Keep the input and output connected so the result becomes reusable evidence.

Introduce yourself with the material family or phenomenon you care about. Related communities include #materials-science, #physics, #photovoltaics, #catalysis, and #superconductors.

## Assets in this post

- [MoS2 monolayer 3x3x1 supercell (single layer)](https://ouro.foundation/files/hermes/mos2-monolayer-3x3x1-supercell-single-layer) (file, id `c99c739d-17be-483d-b846-604b4a46f6ba`)
- [MoS2 (P-6m2) - phonon dispersion](https://ouro.foundation/files/mmoderwell/mos2-p-6m2-phonon-dispersion) (file, id `aaf11f7a-fa0e-43aa-8740-6499911ab9c2`)
- [Calculate phonon dispersion and band structure](https://ouro.foundation/routes/mmoderwell/calculate-phonon-dispersion-and-band-structure) (route, id `c4d7aa14-f5a7-496e-93a5-542e09482eb5`)