This is an example of input file to be given to EXC. For a complete list of input variables see below.
exciton ! important
exc ! full excitonic calculation. this will imply the use of an abinit SCR file
so ! use a scissor operator which implies a value for soenergy,
! alternatively you might use 'gw' which implies the use of an abinit GW file
soenergy 0.6
shiftk ! put this value if you use shifted k-points
matsh 4 ! this is just an update of the old (still working) npwmat
(but instead of giving the total number of plane waves, you give a closed shell)
npwsh 12 ! this is just an update of the old (still working) npwwfn
(but instead of giving the total number of plane waves, you give a closed shell)
nband 8 ! last band to be considered in the calculation
lomo 1 ! first band to be considered: 1 is default
haydock ! use haydock iterative technique: this avoid the full diagonization
niter 100 ! number of iterations in the haydock iterative scheme
omegai 0.0 ! first frequency (eV)
omegae 10.0 ! last frequency (eV)
domega 0.1 ! step of frequency (eV)
broad 0.1 ! Lorentzian broadening (eV)
q 0. 0. 0. ! momentum transfer: (0,0,0) is default, like for optical regime
savememory ! permits to save a little memory
verboselevel 1 ! this is the default. a value of 3 will print out lots of stuff