<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px">Hi,</span><div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">
I am running some tests with hybrid functionals (pbe0 for the moment, HSE later), and I have two questions.</div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">
1) The first one is about the nqx grid. Should it be defined in the same way as a Monkhorst-Pack grid would? In my case, I'm running the tests on a 2-D material, so should one of them be equal to one? I am setting my 2-D material to be contained in the xy plane, so I'm assuming nqx3=1. Is that assumption correct, or would it lead to nonsense results?</div>
<div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">2) The second is also about the nqx grid, but about the convergence of the calculation, and how to transpose those values for supercells. </div>
<div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">Basically, I am reaching convergence in the gap of the material in the unit cell with a 12x12x1 nqx grid (that is, supposing that nqx can indeed be 1, in a "Monkhorst-Pack-fashion") - I suppose that larger values for the nqx(1,2) will not lead to significant differences. </div>
<div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">The next step will be to run a calculation for a 6x6 supercell with a vacancy and see the effect on the electronic charge density and DOS. However, this will be a very expensive calculation, so I wonder if nqx1 and nqx2 could be set to lower values on a 6x6 supercell, with a similar result of that of the unit cell (also similar to what one would do with the Monkhorst-Pack grid).</div>
<div style="font-family:arial,sans-serif;font-size:12.800000190734863px"><br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">Best regards,</div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">
<br></div><div style="font-family:arial,sans-serif;font-size:12.800000190734863px">Marcos</div></div>