mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
44 lines
1.2 KiB
ReStructuredText
44 lines
1.2 KiB
ReStructuredText
|
.. highlight:: c
|
||
|
|
|
||
|
|
.. _intro:
|
||
|
|
|
||
|
|
Introduction
|
||
|
|
=================
|
||
|
|
|
||
|
|
The TRIQS library provides a generic container `gf` and its view `gf_view`, to store and manipulate
|
||
|
|
various Green functions.
|
||
|
|
|
||
|
|
Several specific green functions are implemented :
|
||
|
|
|
||
|
|
* real time(s),
|
||
|
|
* real frequency(ies),
|
||
|
|
* Matsubara time(s),
|
||
|
|
* Matsubara frequency(ies),
|
||
|
|
* Legendre representation.
|
||
|
|
* Block of other green functions.
|
||
|
|
* Cartesian product of green functions.
|
||
|
|
|
||
|
|
Various free functions are also provided to handle transformations between various representation of a Green function,
|
||
|
|
such as Fourier transforms.
|
||
|
|
|
||
|
|
More generally, the variable is a point of a ``domain``
|
||
|
|
|
||
|
|
The value of the Green function on a point of the domain can be a scalar, a matrix or whatever you want (this type is called type ``target_t``).
|
||
|
|
|
||
|
|
You can group several green functions into *blocks* (for example, one block per orbital, or per wave vector...).
|
||
|
|
|
||
|
|
Fourier transforms are implemented for these Green functions:
|
||
|
|
|
||
|
|
real time <-> real frequency
|
||
|
|
|
||
|
|
Matsubara time <-> Matsubara frequency
|
||
|
|
|
||
|
|
|
||
|
|
This section is organized as follows :
|
||
|
|
|
||
|
|
* the concepts related to Green functions, their domain, their representation on a grid.
|
||
|
|
* the container `gf` and its view `gf_view`, which represent various Green functions.
|
||
|
|
|
||
|
|
|
||
|
|
|