I optimized the structure in PBE. Can anyone help me with HSE06 to calculate the optics and DOS of the material from this step? I would be grateful if you could write step by step.
As per my comment,
- If OP is referring to dielectric tensor for "optics", examples can be found here from the VASP Wiki.
- For the density-of-states (DOS), the VASP Wiki has a tutorial here.
- HSE06 tutorials on the VASP Wiki can be found here and here.
- HSE06 DOS tutorial can be found here.
I suggested that OP can click on the INCAR settings in these pages to understand what they do, and combine them appropriately for OP's specific use case of HSE06 DOS calculations.
I'll also give a more "step-by-step" answer, with the caveat that this is just one possible way of doing things that makes sense to me.
- Structure relaxation with PBE
We could have done the structure relaxation with HSE06 but that's going to be very expensive. Use the
CONTCAR from the PBE structure relaxation as the
POSCAR for all subsequent steps.
- Static PBE calculation (optional)
I would suggest performing a static calculation with PBE to generate a
WAVECAR file (set
LWAVE = .TRUE.). I believe that starting the HSE06 calculation with the PBE converged orbitals should speed up convergence.
- HSE06 DOS
For the actual HSE06 calculation, you'd want these
INCAR settings, which can be found in VASP Wiki's HSE06 tutorials linked above. Of course, some of them can be tweaked accordingly.
LHFCALC = .TRUE. ! Hartree-Fock / DFT hybrid ALGO = Damped TIME = 0.5 HFSCREEN = 0.2 ! HSE06 AEXX = 0.25 ! fraction of exact exchange
If you did the previous step of getting a PBE converged
WAVECAR, move it to the directory for this HSE06 calculation. It should be detected when you
start the calculation, but you could explicitly set
ISTART=1 for certainty.
For the DOS, include in the
ISMEAR = -5 (the tetrahedron method), which is important for getting high-quality DOS (see here and this paper), and
LORBIT = 11 to generate
If OP wants practice, it looks like the files can be downloaded for this example from the VASP Wiki (near the bottom of the page).