effmass

6.0easy start · #70 of 91
in Physics Simulation Software

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Linux, Mac, Windows.

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effmass is ranked #70 of 91 in physics simulation software on The Geeks Club. It runs on Linux, macOS, Windows.

Compared on physics simulation software

Free plan: Yes

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The record

Purpose: effmass is a Python package for calculating effective masses from the electronic bandstructure of semiconductors.
Effective mass calculations: It calculates curvature, transport and optical effective masses, including optical mass under a Kane dispersion assumption.
Non-parabolicity: It calculates Kane dispersion parameters to assess non-parabolicity over a selected energy range.
Band extrema: It can locate valence band maxima and conduction band minima, including extrema within an energy range.
Plots: It can plot selected bandstructure segments and quadratic, Kane or higher-order dispersion approximations.
Quasi-Fermi estimate: It estimates the quasi-Fermi level from density-of-states data without thermal smearing; this feature supports VASP and requires DOSCAR.
Supported codes: The documentation lists VASP, FHI-Aims, Castep and ASE as supported codes.
Command line and API: The command line interface provides basic parabolic effective mass calculations, while the Python API provides access to non-parabolic definitions.
Intended users: The package is aimed at theoretical solid state physicists and chemists with basic familiarity with Python.
Installation: The maker's repository documents installation with pip or in a conda environment and also describes installing from GitHub.
Integration dependency: The package uses vasppy to parse VASP output and ASE to parse Castep output.
Support: The maker directs questions, bug reports and feature requests to the GitHub issue tracker.
License: The maker's GitHub repository identifies the project as MIT licensed.
Maker and authorship: The documentation names Lucy Whalley as the author and identifies Northumbria University in the contact email address.

Where it ranks on The Geeks Club

Best Physics Simulation Software in 2026#70 of 91

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Sources

effmass.readthedocs.io/en/stable/· checked 5 Oct 2026
effmass.readthedocs.io/en/stable/Features.html· checked 5 Oct 2026
effmass.readthedocs.io/en/stable/Supported%20codes.html· checked 5 Oct 2026
effmass.readthedocs.io/en/stable/Related%20packages.html· checked 5 Oct 2026
github.com/lucydot/effmass· checked 5 Oct 2026