&control
    calculation = 'scf'
    restart_mode='from_scratch',
    prefix='graphene',
    tstress = .true.,
    tprnfor = .true.,
    pseudo_dir = '/home/germaneau/soft/science/DFT-codes/quantum_expresso/pseudopotentials/pseudo',
    outdir='./',
 /
 &system
    ibrav = 4, celldm(1)=4.6106697593293102,celldm(3)=4.0028256785123464,
    nat  = 2, ntyp = 1,
    nbnd = 30,
    ecutwfc = 40.0,
    ecutrho = 400.0,   
 /
 &electrons
    !diagonalization='cg',
    conv_thr =  1.0d-8,
 /
ATOMIC_SPECIES
   C 12.0107 C.pbe-van_ak.UPF
ATOMIC_POSITIONS (crystal)
C  0.3333 0.6667 0.3333
C  0.0    0.0    0.3333
K_POINTS automatic
16 16 1   1 1 1