Thanks for the question. The dipole matrix elements with k-point sampling are available under the section titled "Periodic Dipole Matrix Elements" in the output file as shown below.<div><br /><div> !-----------------------------------------------------------------------------!</div> Periodic Dipole Matrix Elements<br /><br /> Kpoint: 1 , kx: -0.375000, ky: -0.375000, kz: 0.000000<br /> kp n m Re(dx_nm) Im(dx_nm) Re(dy_nm) Im(dy_nm) Re(dz_nm) Im(dz_nm)<br /><div><br /></div><div>Under this section you will find a table that gives the real and imaginary x, y and z components of the Bloch-state dipole matrix elements:</div><div><div><br /></div><div>μ_nm(k) = <u_nk | <span style="color: rgb(32, 33, 34); font-family: sans-serif; font-size: 16px;">∇</span>_k | u_mk></div><div><br /></div><div>computed for each k-point provided by the user along a line or a grid.</div><div><br /></div><div>These are transition dipole matrix elements between Bloch states. I am not sure what you are referring to as the total crystal dipole moment. The total dipole moment for a system with charge separation is calculated as the vector sum of all individual molecular or bond dipole moments within the crystal structure: μ=Σ q_i <b>d</b>_i. That quantity is not calculated here.</div><div><br /></div><div>Hope this helps.</div><div><br /></div><div>Kind regards,</div><div>Shridhar </div></div></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Tuesday, May 12, 2026 at 4:47:58 PM UTC+2 pierre.an...@gmail.com 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 all,<div><br></div><div>The ability to access dipole moments with KPOINTS is a major addition to CP2K. Still, I'm confused as to where the dipole moment actually is in the output file.</div><div><br></div><div>I tried the test file provided with CP2K 2026.1, but I cannot find the dipole moment for each k-point or for the crystal.</div><div><br></div><div>Could you please let me know where this information is? I'm particularly interested in the total crystal dipole moment.</div><div><br></div><div>Kind regards</div><div>Pierre </div><div><br></div></blockquote></div>
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