Estimate the ZPR at the band edges with the generalized Frohlich modelΒΆ

Flow to estimate the zero-point renormalization at the band edges using the generalized Frohlich model. The flow uses DFPT to compute the effective masses at the band edges (automatically detected by performing a NSCF run with a k-path), BECS, eps_inf and phonon frequencies at Gamma

import sys
import os
import as abidata
import abipy.abilab as abilab
import abipy.flowtk as flowtk

def make_scf_input(usepaw=0):
    """Returns the GS input file"""
    # Here we use parameters similar to
    pseudos = abidata.pseudos("Ca.psp8", "O.psp8")

    structure = dict(
        acell=3 * [9.136],
           0.0000000000, 0.0000000000, 0.0000000000,
           0.5000000000, 0.5000000000, 0.5000000000],
           0  , 0.5, 0.5,
           0.5, 0  , 0.5,
           0.5, 0.5, 0],
        typat=[1, 2],
        znucl=[20, 8],

    scf_input = abilab.AbinitInput(structure=structure, pseudos=pseudos)

        ecut=30,               # Underconverged ecut.
        kptrlatt=[-2,  2,  2,  # In cartesian coordinates, this grid is simple cubic
                   2, -2,  2,
                   2,  2, -2],

    return scf_input

def build_flow(options):
    # Set 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_")

    # Build the SCF input.
    scf_input = make_scf_input()

    # Build the flow.
    from abipy.flowtk.effmass_works import FrohlichZPRFlow
    flow = FrohlichZPRFlow.from_scf_input(options.workdir, scf_input, ndivsm=4, tolwfr=1e-16,

    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()])

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__":
run frohlich zpr

Run the script with:

run_frohlich_zpr -s

Total running time of the script: ( 0 minutes 0.625 seconds)

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