<div dir="ltr"><div><div><div><div>Dear Eduardo,<br><br></div>You are right. Thumb rule is: there is no appreciable splittings in the band edges with atoms with at. number < 40. However, if the crystal is having time reversal symmetry and your are working with multiple layers, I would suggest to take fully relativistic, nc, core-corrected pseudo for all the species. In this way you can get the spin occupancy in different |n,k> due to different atoms. This kind of approach will give you much detailed information when you calculate the 1st and second order electron-phonon self energies/GW/BSE, etc.<br></div><br></div>Regards,<br></div>Sitangshu<br><div><div><div><div> <br></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 8, 2018 at 1:57 AM, Eduardo Menendez <span dir="ltr"><<a href="mailto:eariel99@gmail.com" target="_blank">eariel99@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Dear Sitangshu,</div><div><br></div><div>Could you, please, expand your answer? I used to think that the spin-orbit coupled pseudopotential is no needed for the light atom. <br>I just think that the spin components are in the wave function as long as one set noncollinear=.true. , or, alternatively, that the coupling terms in the psp of light atoms should be very small. <br></div><div><br></div><div>Is there any article explaing the theory of spin-orbit coupled pseudopotential calculations and/or pseudopotential generation?<br></div><div><div><br></div><div>Best regards, <br clear="all">
Eduardo Menendez Proupin</div><div>University of Chile<br></div><div><br>---------- Mensaje reenviado ----------<br>From: Sitangshu Bhattacharya <<a href="mailto:sitangshu@iiita.ac.in" target="_blank">sitangshu@iiita.ac.in</a>><br>To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org" target="_blank">pw_forum@pwscf.org</a>><br>Cc: <br>Bcc: <br>Date: Sat, 6 Jan 2018 22:47:40 +0530<br>Subject: Re: [Pw_forum] If one atom is heavy, another is lighter, what type of pseudo potentials should be used ?<span class=""><br><div><div><div>Dear Jagadish,<br><br></div>It
depends what you are trying to achieve. For example, spins are required
for all elements if your target is to compute optical processes... etc.
<br><br></div>Regards<br></div>Sitangshu<br><br></span></div></div></div>
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