<div dir="ltr"><div><div><div><div>Dear Dr. Rui and QE experts,<br><br></div>Thank you for your response. I will try to look into Harrison's book and come back later if I have more doubts. <br><br></div>I have a really ugly approach in mind, not sure if it is valid or not. Can you (or someone) please comment on this?<br><br>Let's say I generate scalar and fully relativistic pseudopotential using same parameters and find the difference between them at each grid point.<br></div></div>Can we call this difference the SOC term? If so, can I use a parameter lambda (from 0 to 1) to scale the difference and then add back to the scalar relativistic pseudopotential so that when lambda is 0, it is the scalar relativistic PP and when lambda is 1, it is fully relativistic PP? <br><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jan 21, 2017 at 5:24 PM, Rui Pang <span dir="ltr"><<a href="mailto:taichizi@mail.ustc.edu.cn" target="_blank">taichizi@mail.ustc.edu.cn</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear <span style="line-height:16.8px">Niraj</span><div>Usually it can be realized by fitting a tight binding model from a scarlar relativestic band structure and add the SOC in the TB model to recalculate the band structure. Detail of the later step can be found in the 'elementary electronic structure' by Harrison. But this method is without SCF.</div><div>Someone told me that one can change the value of light`s speed to change the SOC. I am not sure if it works in QE. <br>Best wishes.</div><div>Pang Rui.<br><br><blockquote name="replyContent" class="m_-5578796364201807529ReferenceQuote" style="padding-left:5px;margin-left:5px;border-left:#b6b6b6 2px solid;margin-right:0">-----原始邮件-----<br>
<b>发件人:</b><span id="m_-5578796364201807529rc_from">"Niraj Aryal" <<a href="mailto:debonairniraj@gmail.com" target="_blank">debonairniraj@gmail.com</a>></span><br>
<b>发送时间:</b><span id="m_-5578796364201807529rc_senttime">2017-01-22 04:04:19 (星期日)</span><br>
<b>收件人:</b> <a href="mailto:pw_forum@pwscf.org" target="_blank">pw_forum@pwscf.org</a><br>
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<b>主题:</b> [Pw_forum] Tuning Spin Orbit Coupling parameter<div><div class="h5"><br><br><div dir="ltr"><div><div><div><div>Dear QE experts,<br><br></div>I am curious to study how the material properties vary as a function of spin orbit coupling (SOC) strength. <br><br>The motivation behind this is many e.g. I want to see numerically how the strength of SOC changes the band topology in topological insulators like Bi2Se3 or the possible metallic to insulating (or vice versa) phase change in materials with big SOC. Though this gives artificial material, this could possibly give more intuition in materials design.<br><br></div>I know that it is possible and has been done for different purpose at least in this paper by Wang, Yates, Souzo and Vanderbilt:<br><a href="https://arxiv.org/pdf/cond-mat/0608257v1.pdf" target="_blank">https://arxiv.org/pdf/cond-mat<wbr>/0608257v1.pdf</a><br><br></div>Can someone guide me on how to tune the SOC? I guess the tuning has to be done in the pseudopotential file itself, right? Is there some kind of flag/or parameter I can find in pseudopotential generation code like atomic to tune SOC?<br><br>Are there any other ways?<br></div><br><div><div><div><div>I would appreciate any response on this problem.<br clear="all"></div><div><div><div><div><br><br><div class="m_-5578796364201807529m_2824304545336578577gmail_signature"><div dir="ltr">With regards<br><br>Niraj Aryal<br>Graduate Student<br><div>Florida State University</div><div>Tallahassee, Florida-32304<br><br></div></div></div>
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</div></div></blockquote><br><span>--<br><div style="line-height:16.8px"><span style="line-height:16.8px">Pang Rui, Lectureer</span></div><div style="line-height:16.8px">School of physics and engneering</div><div style="line-height:16.8px">Zhengzhou University</div><div style="line-height:16.8px">China</div></span></div><br>______________________________<wbr>_________________<br>
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<a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">http://pwscf.org/mailman/<wbr>listinfo/pw_forum</a><br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">With regards<br><br>Niraj Aryal<br><div>Florida State University</div><div>Tallahassee, Florida-32304<br><br></div></div></div>
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