I want to get the excitons band structures at finite momentum q, and how to specify the range of the q in ypp input? (>ypp -e i gives the input as below:
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#
excitons # [R] Excitonic properties
interpolate # [R] Interpolate
INTERP_mode= "BOLTZ" # Interpolation mode (NN=nearest point, BOLTZ=boltztrap aproach)
INTERP_Shell_Fac= 20.00000 # The bigger it is a higher number of shells is used
INTERP_NofNN= 1 # Number of Nearest sites in the NN method
BANDS_steps= 100 # Number of divisions
cooIn= "rlu" # Points coordinates (in) cc/rlu/iku/alat
cooOut= "rlu" # Points coordinates (out) cc/rlu/iku/alat
States= "1 - 1" # Index of the BS state(s)
BSQindex= 1 # Q-Index of the BS state(s)
%BANDS_kpts # K points of the bands circuit
0.000000| 0.000000| 0.000000|
0.333333| 0.333333| 0.000000|
%
Thanks!
Yaning