Yambo is a computer software package for studying many-body theory aspects of solids and molecule systems.
[1][2] It calculates the excited state properties of physical systems from first principles, e.g., from quantum mechanics law without the use of empirical data.
It can also handle collinear (i.e., spin-polarized wave functions) and non-collinear (spinors) magnetic systems.
Yambo uses a plane waves basis set to represent the electronic (single-particle) wavefunctions.
For such systems Yambo offers two numerical techniques for the treatment of the Coulomb integrals: the cut-off[18] and the random-integration method.