<div><p>Dear CP2K developers,</p><p>I would like to follow up on this topic regarding the calculation of Hubbard U using the linear-response approach in CP2K.</p><p>I noticed that in a previous discussion (May 2024), it was mentioned that the linear-response calculation of Hubbard U was not yet implemented in CP2K and that a scripted workflow might be required.</p><p>Recently, I came across the work by Liu, Chai, Si, O'Regan and co-workers on the implementation of the Minimum-Tracking Linear Response (MT-LR) Hubbard and Hund corrected DFT method in CP2K. According to the publication, the MT-LR framework for determining Hubbard U and Hund J parameters was implemented within Quickstep.</p><p>I am currently using CP2K 2026.1 and would like to know:</p><ol><li><p>Has the MT-LR method for calculating Hubbard U (and possibly Hund J) been fully integrated into the current public release of CP2K?</p></li><li><p>If so, could you please point me to the relevant documentation or provide the corresponding input keywords/workflow?</p></li><li><p>If this functionality is not yet available in the public release, what would be the recommended approach for obtaining reliable U values for transition-metal oxides (e.g., TiO₂) within CP2K? Would a manual linear-response procedure or another first-principles approach be recommended?</p></li></ol><p>Any suggestions or references would be greatly appreciated.</p><p>Thank you very much for your time and help.</p><p>Best regards,</p><p>Cao Y.</p></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">在2024年5月17日星期五 UTC+8 19:50:30<Matt Watkins> 写道:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I don't belive this is currently implemented in cp2k. You might be able to script something to the effect.<br><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Friday 10 May 2024 at 16:23:08 UTC+1 Jundi Wang wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear CP2K developers,<div><br></div><div>I am writing to ask how to use linear response method to calculate Hubbard U in CP2K. I find the way to do both the self-consistent calculation and the Non-self-consistent calculation, but I don't know how to apply energy (<span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;font-size:12px;text-align:-webkit-center">α</span>) to a specific orbital of a specific atom to obtain the corresponding electron occupation number. I don't know if there is a function that can be implemented in cp2k.</div><div><br></div><div>Thank you for your help,</div><div>wjd</div></blockquote></div></blockquote></div>
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