Thanks for your reply.

1. In GW calculation(with -g n), the output is

K-point Band Eo E E-Eo DFT HF Sc |Eo Sc|E dSc/dw|Eo

#

1.000 3.000 -.7424 -1.782 -1.040 -23.11 -28.94 4.561 4.783 -.2136

1.000 4.000 -.7424 -1.820 -1.078 -23.11 -28.94 4.517 4.747 -.2134 0.8241 -.1335E-2 17.70 37.18

Actually, I don't understand the meaning of some column, f.e Sc|Eo, dSc/dw|Eo and Width.

Q1 : What is the meaning of them? And what is the definition of width?

Width is the imaginary part of the self-energy

Z is the renormalization factor (you find the definition in MBPT books)

Sc is the real part of the correlation self-energy

The E or Eo in front I think depends it they are evaluated at the bare or at the QP pole(not sure)

2. Indeed, I can obtain the frequency-dependent Green's function in real-axis GW calculaton (-d -g g) and the output like :

Energy Re[G] |Im(G)| Re(S_tot) |Im(S_c)| Re(S_c)

-5.742438 -.4152761 0.3928327E-2 -2.592178 0.2277692E-1 3.230304

-5.742138 -.4153412 0.3929308E-2 -2.592256 0.2277546E-1 3.230226

Q2 : Is Re[G] the real part of Green's function (|Im(G)| for the Imaginary part )? And what is the meaning of Re(S_tot),|Im(S_c)| and Re(S_c)?

S_tot is the total self-energy, S_c the correlation part

3. From Yambo Tutorials, I understand that PPA, COHSEX and real-aixs are implemented in GW calculation.

Q3 : can I do a GW calculation within Random Phase Approximation instead of PPA or COHSEX?

If I undertand what you mean, RPA is what is yambo si called real-axis, i.e. byond PPA.

You do not put -p p nor -p c when generating the input

4. I want to do a GW calculation along a chosen k path, which is not uniform. From Tutorials, a new set of k-points containing chosen ones can be generated by BZ kpoint grid generator in ypp (ypp -k k). But when I add three new k-points into the list like:

%GWKpts # K points list

0.00000| 0.50000| 0.00000

0.00000| 0.48979| 0.00000

0.00000| 0.47959| 0.00000

%

Only the 3-rd point is in the new set of k-points.

Q4 : Can I generate a new set of k-points with more than one chosen point in ypp?

Yeah, you should be able.

I'm not ure hat is happening here.

Best,

D.