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CODE:
ibrav = 4,
celldm(1) = a*sqrt(3),
celldm(3) = N,

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CODE:
ibrav = 0,
celldm(1) = a*sqrt(3),
CELL_PARAMETERS cubic
1.0  0.0  0.0
-0.5  sqrt(3)/2  0
0.0  0.0  N

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CODE:
ATOMIC_POSITIONS crystal
  C  2/3  1/3  1/2
  C  1/3  2/3  1/2

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CODE:
acell  2*a*sqrt(3)  N
rprim
1.0  0.0  0.0
-0.5  sqrt(3)/2  0
0.0  0.0  1.0
natom  2
ntypat  2
znucl  6
typat  1  1
xred
  1/3  2/3  1/2
  2/3  1/3  1/2

¶øELK£¬Ôò¿ÉÒÔÊÇ:
CODE:
scale
  a*sqrt(3)
avec
  1.0  0.0  0.0
  -0.5  sqrt(3)/2  0
   0.0  0.0  N
atoms
1
'C.in'
2
0.3333333333  0.6666666667  0.0000000000  0.0000000000  0.0000000000  0.0000000000
0.6666666667  0.3333333333  0.0000000000  0.0000000000  0.0000000000  0.0000000000

VASPµÄPOSCAR£º
CODE:
Graphene
  a*sqrt(3)
        1.0  0.0  0.0
        -0.5  sqrt(3)/2  0
         0.0  0.0  N
  2
Direct
   1/3  2/3  1/2
   2/3  1/3  1/2

×îºóÊÇCASTEPµÄ*.cellÎļþ£º
CODE:
%BLOCK LATTICE_CART
  a*sqrt(3)  0.0  0.0
  -a*sqrt(3)/2  a*3/2  0
  0.0  0.0  N
%ENDBLOCK LATTIC_CART
%BLOCK POSITIONS_FRAC
  C  1/3  2/3  1/2
  C  2/3  1/3  1/2
%ENDBLOCK POSITIONS_FRAC

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