yambo input file structure

The yambo input file has a two column format. In the left column you will find the list of input variables (their names, values and units), while on the right you will find their description and their environment.

Variables in a yambo input file can be divided into:

• Runlevels (R): specified at the top of the file, these are set according to the command line option used.
• Flags (F): This type of variable can be either "on" or "off": remove the "#" to switch its value.
• Static variables: Variables that are read from an existing database.
• Alive variables: Variables that can be changes from run to run.

Environments are divided into physical environments, several of which can appear in a single yambo run, and technical environments, which describe some of the internal workings of yambo.

Technical environments

• Runlevels
• Initialization
• K-points analysis
• FFT

Physical environments

• The single-particle Green's function (G)
• The response functions (Xd/Xd)
• The response function in the plasmon-pole approximation (Xp)
• Linear response & Optical properties (LR/OPT)
• The GW method (GW)
• The exchange yambo-energy (XX)
• The Bethe-Salpeter Kernel (BSK)
• The Bethe-Salpeter equation solvers (BSS)
• Time-Dependent Density Functional Theory (TDDFT)

For example, part of the optics input file is:

 yambo -o c :
 optics              # (R)(OPT)Optics
 FFTGvecs=459     RL # (FFT) Plane-waves