.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "flow_gallery/run_becs_and_epsilon_vs_kpts.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code or to run this example in your browser via Binder .. rst-class:: sphx-glr-example-title .. _sphx_glr_flow_gallery_run_becs_and_epsilon_vs_kpts.py: Flow for Born effective charges and dielectric tensors with DFPT ================================================================ This example shows how to compute the Born effective charges and the dielectric tensors (e0, einf) of AlAs with AbiPy flows. We perform multiple calculations by varying the number of k-points in order to analyze the convergence of the results wrt nkpt .. GENERATED FROM PYTHON SOURCE LINES 11-99 .. code-block:: default import sys import os import abipy.abilab as abilab import abipy.data as abidata from abipy import flowtk def make_scf_input(ngkpt, paral_kgb=0): """ This function constructs the input file for the GS calculation for a given IBZ sampling. """ # Crystalline AlAs: computation of the second derivative of the total energy structure = abidata.structure_from_ucell("AlAs") pseudos = abidata.pseudos("13al.981214.fhi", "33as.pspnc") gs_inp = abilab.AbinitInput(structure, pseudos=pseudos) gs_inp.set_vars( nband=4, ecut=2.0, ngkpt=ngkpt, nshiftk=4, shiftk=[0.0, 0.0, 0.5, # This gives the usual fcc Monkhorst-Pack grid 0.0, 0.5, 0.0, 0.5, 0.0, 0.0, 0.5, 0.5, 0.5], #shiftk=[0, 0, 0], paral_kgb=paral_kgb, tolvrs=1.0e-10, ixc=1, diemac=9.0, #iomode=3, ) return gs_inp def build_flow(options): """ Create a `Flow` for phonon calculations. The flow has two works. The first work contains a single GS task that produces the WFK file used in DFPT Then we have multiple Works that are generated automatically in order to compute the dynamical matrix on a [4, 4, 4] mesh. Symmetries are taken into account: only q-points in the IBZ are generated and for each q-point only the independent atomic perturbations are computed. """ # Working directory (default is the name of the script with '.py' removed and "run_" replaced by "flow_") if not options.workdir: options.workdir = os.path.basename(sys.argv[0]).replace(".py", "").replace("run_", "flow_") flow = flowtk.Flow(workdir=options.workdir) for ngkpt in [(2, 2, 2), (4, 4, 4), (8, 8, 8)]: # Build input for GS calculation with different k-meshes scf_input = make_scf_input(ngkpt=ngkpt) flow.register_scf_task(scf_input, append=True) for scf_task in flow[0]: bec_work = flowtk.BecWork.from_scf_task(scf_task) flow.register_work(bec_work) return flow # This block generates the thumbnails in the AbiPy gallery. # You can safely REMOVE this part if you are using this script for production runs. if os.getenv("READTHEDOCS", False): __name__ = None import tempfile options = flowtk.build_flow_main_parser().parse_args(["-w", tempfile.mkdtemp()]) build_flow(options).graphviz_imshow() @flowtk.flow_main def main(options): """ This is our main function that will be invoked by the script. flow_main is a decorator implementing the command line interface. Command line args are stored in `options`. """ return build_flow(options) if __name__ == "__main__": sys.exit(main()) .. image:: /flow_gallery/images/sphx_glr_run_becs_and_epsilon_vs_kpts_001.png :alt: run becs and epsilon vs kpts :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 100-126 Run the script with: run_becs_and_epsilon_vs_kpts.py -s Use: abirun.py flow_becs_and_epsilon_vs_kpts/ listext DDB to list all the DDB files produced by the flow. Now use abicomp.py to create a DdbRobot to analyze the DDB files produced by the 3 Works: abicomp.py ddb flow_becs_and_epsilon_vs_kpts/w*/outdata/out_DDB the inside the ipython terminal use the anacompare methods to analyze the results. e.g. .. code-block:: ipython In [1]: r = robot.anacompare_epsinf() In [2]: r.df Out[2]: xx yy zz yz xz xy formula chneut \ 0 13.584082 13.584082 13.584082 0.0 0.0 0.0 Al1 As1 1 0 9.268425 9.268425 9.268425 0.0 0.0 0.0 Al1 As1 1 0 8.873178 8.873178 8.873178 0.0 0.0 0.0 Al1 As1 1 .. rst-class:: sphx-glr-timing **Total running time of the script:** ( 0 minutes 1.040 seconds) .. _sphx_glr_download_flow_gallery_run_becs_and_epsilon_vs_kpts.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: binder-badge .. image:: images/binder_badge_logo.svg :target: https://mybinder.org/v2/gh/abinit/abipy/gh-pages?filepath=notebooks/flow_gallery/run_becs_and_epsilon_vs_kpts.ipynb :alt: Launch binder :width: 150 px .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: run_becs_and_epsilon_vs_kpts.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: run_becs_and_epsilon_vs_kpts.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_