quantum-espresso/PW/examples/EXX_example/README.gaupbe

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HOW TO USE GAU-PBE HYBRID FUNCTIONAL?
keyword is input_dft='gaupbe' and it should be used simultaneouly with
keyword exxdiv_treatment='none' and x_gamma_extrapolation = .false.
for example,
input_dft='gaupbe',
exxdiv_treatment='none'
x_gamma_extrapolation = .false.
gau-pbe hybrid functional is free from integrable singularity problem, which
enables to decrease k and q grids compared with other hybrid functionals.
Please report problems and suggestions to QE developers (in particolar:
Jong-Won Song <joshua.sjw@gmail.com>
Stefano de Gironcoli <degironc@sissa.it>,
and keep in mind that this feature is still experimental.