hello all, i am trying to apply electric field with saw-tooth like potential to bilayer graphene. but i face with problem in relaxing coordinates and lattice parameters. it doesnt converged. please help me. my input file is: &CONTROL calculation = 'vc-relax' , restart_mode = 'from_scratch' , wf_collect = .true. , outdir = './out' , wfcdir = './out' , pseudo_dir = './' , verbosity = 'high' , etot_conv_thr = 1.0D-6 , forc_conv_thr = 1.0D-3 , tstress = .true. , tprnfor = .true. , tefield = .true. , dipfield=.true., / &SYSTEM ibrav = 4, celldm(1) = 4.6487259319, celldm(3) = 10.162601626, nat = 4, ntyp = 1, ecutwfc = 30 , ecutrho = 180 , occupations = 'smearing' , degauss = 0.0100 , smearing = 'gaussian' , input_dft = 'vdW-DF' , edir = 3 , emaxpos = 0.7833 , eopreg = 0.2167 , eamp = 0.019447 , / &ELECTRONS electron_maxstep = 200, conv_thr = 1.0d-6 , mixing_mode = 'plain' , mixing_beta = 0.3 , diagonalization = 'cg' , / &IONS ion_dynamics = 'bfgs' , / &CELL cell_dynamics = 'bfgs' , cell_factor = 5d0 , / ATOMIC_SPECIES C 12.01100 C.blyp-mt.UPF ATOMIC_POSITIONS crystal C 0.333333330 0.666666660 0.5666 C 1.000000000 0.000000000 0.5666 C 0.666666660 0.333333330 0.4334 C 1.000000000 0.000000000 0.4334 K_POINTS automatic 16 16 1 0 0 0
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