triqs.gfs

Green’s function containers, descriptors and utilities for TRIQS.

This package gathers the user-facing API for working with Green’s functions in TRIQS. It is imported with:

>>> from triqs.gfs import *

The main classes provided by the package are:

Gf: Generic Green’s function: a numpy array indexed by a mesh and an optional target space.
BlockGf: Block-diagonal Green’s function: a named collection of Gf blocks (e.g. spin-up / spin-down).
Block2Gf: Two-index block-diagonal Green’s function, indexed by a pair of block names.

It also re-exports the mesh classes from triqs.mesh.

In addition, the package provides

lazy initializers used on the right-hand side of g << ... (frequency placeholders, semicircular and flat DOS, Fourier and Legendre transforms),
utilities for inverting Green’s functions, solving Dyson’s equation and computing hybridization functions,
block-wise mapping over BlockGf / Block2Gf,
high-frequency tail fitting and replacement,
enforcement of Hermiticity and time-reversal symmetries,
transforms between meshes, and
DLR representation factories.

Modules

`backwd_compat`	Backward-compatibility aliases for legacy Green's function type names.
`block2_gf`	Two-index block-diagonal Green's function container (`Block2Gf`).
`block_gf`	Block-diagonal Green's function container (`BlockGf`).
`descriptor_base`	Protocol classes for Green's function descriptors.
`descriptors`	Concrete Green's function descriptors used with the `<<` operator.
`dlr_crm_dyson_solver`	Constrained-residual minimization (CRM) Dyson solver for DLR Green's functions.
`gf`	Generic Green's function container (`Gf`).
`gf_factories`	Factory functions that build a new `Gf` or `BlockGf`.
`gf_fnt`	Free functions operating on a `Gf` or `BlockGf`.
`lazy_expressions`	Small expression-tree library used by Green's-function descriptors.
`plot`	Plot-protocol back-end for Green's functions.
`semicirc`	Green's function for a semi-circular density of states.
`tools`	Pure-Python utilities operating on `Gf` and `BlockGf`.
`wrapped_aux`	Internal C++ dispatchers backing `Gf`.