Dear all:
I want to get quasiparticle energies of some specific K points. But I don't know how to input the K points into input file.
For example, I try to calculate quasiparticle energies of (0.4, 0, 0.4) of Si, with 5*5*5 K points generation in BZ, and no-shifted. I think (0.4, 0, 0.4) is included in BZ Q-points (125), but not included in IBZ Q-points.
Thanks
Tieyu Lu
How to get quasiparticle energies of a specific K point?
Moderators: Davide Sangalli, andrea.ferretti, myrta gruning, andrea marini, Daniele Varsano
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How to get quasiparticle energies of a specific K point?
Tieyu Lu
Physics Department of Xiamen university (China)
Physics Department of Xiamen university (China)
- andrea marini
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Re: How to get quasiparticle energies of a specific K point?
Dear Tieyu Lu,
this is indeed a tricky point. Yambo requires as input a uniform k-grid {k_i}. This is contracted in the IBZ resulting in a certain number of k-points that are printed in any report file. Now starting from grid Yambo generates the corresponding grid of transferred momenta {q_j}. You can calculate QP corrections for
Andrea
this is indeed a tricky point. Yambo requires as input a uniform k-grid {k_i}. This is contracted in the IBZ resulting in a certain number of k-points that are printed in any report file. Now starting from grid Yambo generates the corresponding grid of transferred momenta {q_j}. You can calculate QP corrections for
- any k-point in the grid {k_i} (in the IBZ)
- any k-point of the BZ that is obtained by rotating a k-point of the grid {k_i}. In this case the QP correction is the same of original, un-rotated point, for symmetry reasons.
Andrea
Andrea MARINI
Istituto di Struttura della Materia, CNR, (Italy)
Istituto di Struttura della Materia, CNR, (Italy)
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Re: How to get quasiparticle energies of a specific K point?
Dear Lu,
If the special point is included in the BZ, there must be an equivalent point in the IBZ. If not, why do we call it IBZ?
To find out the equivalent point, I plot all the points in the BZ and IBZ. Based on the symmetry of BZ, it is easier to spot that equivalent point.
Sincerely,
If the special point is included in the BZ, there must be an equivalent point in the IBZ. If not, why do we call it IBZ?
To find out the equivalent point, I plot all the points in the BZ and IBZ. Based on the symmetry of BZ, it is easier to spot that equivalent point.
Sincerely,
Guangfu Luo
Institute for Molecular Science
National Institutes of Natural Sciences, Japan
Institute for Molecular Science
National Institutes of Natural Sciences, Japan