It seems me that the 2d-sheet is placed in the yz-plane.
--- your system:
ATOMIC_POSITIONS {alat}
Mo 0.000000000 0.000000000 0.000000000
S 0.500000000 0.288675135 -0.492491069
S 0.500000000 0.288675135 0.492515463
Mo 0.500000000 0.288675135 1.969804069
S -0.000000000 -0.000000000 1.477442788
S -0.000000000 -0.000000000 2.462449934
K_POINTS {automatic}
13 13 1 0 0 0
-----
So the K_POINTS should be '1 13 13 0 0 0'.
Also you should check the direction of the e-field. Your
setting is 'edir=3' (z-direction), therefore the field is
applied perpendicular to the sheet.
best regards
kazume NISHIDATE
敬具 西館数芽
[email protected]
[email protected]
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