henhans/gftools

Green's function DSL

Overview

gftools is a set of tools to work with numerical condmat problems. It provides three basic classes of objects:

• grids. There exists a set of implementation of grids for common purposes:
  • matsubara_grid<b>. A grid of Matsubara frequencies. "b" corresponds to a choice of fermionic(1) or bosonic(0) grids.
  • real_grid . A grid of floats, e.g. frequencies.
  • kmesh. An equidistant periodic set of points (for sampling Brillouine zones).
  • enum_grid. A grid of integers.
• container<ValueType, N>. A recursive multidimensional container of depth to store ValueType objects.
• grid_object<ValueType, Grids...>. Green's function. In a broader scope - a multidimensional object that is defined on a set of grids (Grids...) that contains ValueType values. Examples :
  • grid_object<complex_type,matsubara_grid<1>> - Green's function in imaginary frequencies
  • grid_object<complex_type,matsubara_grid<1>,kmesh> - Green's function in imaginary frequencies and reciprocal 1d space.
  • grid_object<complex_type,real_grid> - Retarded or Advanced Green's function, etc...

Look for examples in "example/" directory for detailed information.

Installation

The code is is provided as a header-only library with a set of examples and tests. The gftools.hpp in the repo root can be included in any derivative projects. To compile examples and tests create a build directory and run

1. cmake -DExamples=ON -DTesting=ON {path_to_gftools}
2. make
3. make test (for running tests)
4. example will be build in example subdirectory
5. make doc to generate documentation

Dependencies

• c++11-compatible compiler (tested with clang >= 3.1, gcc >= 4.8.2, icpc >= 14.0.2)
• Boost headers
• Eigen >=3.1
• git to fetch the code
• cmake to build tests and examples (optional)
• doxygen for documentation (optional)

Extra features

• FFT support via FFTW
• HDF5 support via alpscore (http://www.alpscore.org)

Author

• Andrey Antipov, Andrey.E.Antipov[at]gmail.com, 2013-now.

Distribution

Open-source under GPLv2 license.

Academic usage

Please attribute this work by a citation to arXiv:1705.00024 (2017).