Calculation about Chern number

Dominik Gresch greschd at
Tue Oct 3 12:59:50 CEST 2017

Dear Wenliang Liu,

These inputs are described in the README for pw2z2pack:

They are needed only if you want to consider only the Chern number in a 
specific symmetry eigenspace. In that case, 'isym' is the index of the 
symmetry (w.r.t. the standard Quantum Espresso output), and sym_eig is 
the symmetry eigenvalue of the considered eigenspace.

Best regards,

Dominik Gresch

On 01.10.2017 02:32, wlliu wrote:
> Dear Sir,
> My name is Wenliang Liu. I come from Xiangtan University, 
> Xiangtan,Hunan Provience, China.
> I'm writing to enquire about  how I set these two parameters( isym and 
> sym_eig) in the  file
> Thanks a  lot and forward to hearing from you soon.
> Best Regards,
> Wenliang Liu

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