[Pw_forum] HSE

[hannu.komsa at epfl.ch]

Hi Leonardo,

It is HSE06.

I'm not sure where you got the value 0.15 bohr^-1 for HSE06. You can  
see in Krukau et al., JCP 125, 224106 (2006), that they say to use  
0.11 bohr^-1 (or 0.15/sqrt(2)). (Also compare, in VASP they use 0.2  
Angstrom^-1.) The same value is used for both PBE and HF parts.

Shameless plug: some small details about the implementation can also  
be found in Komsa et al., PRB 81, 205118 (2010).


Best regards,
   Hannu-Pekka Komsa
   EPFL, Switzerland


> I would like to know exactly which "version" of HSE is implemented  
> on Quantum-ESPRESSO.
> In the original HSE work a value for the screening parameter w is  
> used, but on an errata another value is given.
>
> In recent publications they are usually called HSE03 (which uses  
> w_{HF}=0.15/sqrt(2) and w_{PBE}=0.15 x 2^(1/3) ) and HSE06  
> (w_{HF}=w_{PBE}=0.15).
>
> Looking at the code insde funct.f90 I found "screening_parameter =  
> 0.106", which is the value of w_{HF} used on HSE03, which induces me  
> to think that it's this "version" that is implemented.
> I couldn't find though if this value is used also for w_{PBE} (which  
> would be a mistake) or not (and w_{PBE} is corrected at a later  
> point in calculation).
>
> Can someone give me some info?