On the recordRead 11 Oct 202616 facts
ctseg
Plans and prices
CTSEG
Free
Free software; requires TRIQS; perpendicular spin-spin expansion is supported only for a single orbital
Read 11 Oct 2026 · triqs.github.io
On the record
- Algorithm
- The double expansion samples powers of the hybridization function and perpendicular spin-spin interaction to measure observables such as the Green’s function.triqs.github.io · read 11 Oct 2026
- Authors
- The TRIQS/ctseg solver was written by N. Kavokine and O. Parcollet, with contributions from H. Lu and N. Wentzell.triqs.github.io · read 11 Oct 2026
- Delivery mode
- desktoptriqs.github.io · read 24 Sep 2026
- Dependency
- Building CTSEG from source requires the TRIQS library, and CTSEG must match TRIQS in its major and minor version numbers.triqs.github.io · read 11 Oct 2026
- Installation
- The project documents Ubuntu 24.04 Debian packages, Linux and OSX Anaconda packages, Docker, and building from source.triqs.github.io · read 11 Oct 2026
- Interactions
- It supports possibly retarded density-density and spin-spin interactions on the impurity.triqs.github.io · read 11 Oct 2026
- License
- TRIQS, the software ecosystem CTSEG is based on, is free software distributed under the GPL license.triqs.github.io · read 11 Oct 2026
- Measurement constraint
- With perpendicular spin-spin interactions, the improved self-energy estimator is available only when the spin-spin interactions are rotationally invariant.triqs.github.io · read 11 Oct 2026
- Measurements
- Documented observables include imaginary-time Green’s functions, self-energy estimators, densities, density correlations, two-particle Green’s functions, state histograms, and perturbation-order histograms.triqs.github.io · read 11 Oct 2026
- Offline access
- Yestriqs.github.io · read 24 Sep 2026
- Orbital limit
- The perpendicular spin-spin expansion is supported only for a single orbital; for multiple orbitals, only expansion in the hybridization function is possible.triqs.github.io · read 11 Oct 2026
- Performance
- Under its supported interaction restrictions, CTSEG provides better performance than the generic CTHYB solver.triqs.github.io · read 11 Oct 2026
- Purpose
- CTSEG is a TRIQS-based hybridization-expansion segment-picture solver for quantum impurities coupled to an external bath.triqs.github.io · read 11 Oct 2026
- Reproducibility
- The installation guide recommends stable releases of TRIQS and its applications for reproducible scientific calculations.triqs.github.io · read 11 Oct 2026
- Support
- The TRIQS project points users to GitHub Discussions and GitHub issues for help with problems.triqs.github.io · read 11 Oct 2026
