<div dir="ltr"><div>In the manual of calculating electron-phonon interaction coefficients:</div><div><br></div><a href="http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/node9.html">http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/node9.html</a><br>
<div><br></div><div>Item 1 says that: "<span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">The latter MUST contain all </span><img width="16" height="20" align="BOTTOM" border="0" src="http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/img8.png" alt="$ \bf k$" style="color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: medium;"><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"> </span>and <img width="16" height="20" align="BOTTOM" border="0" src="http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/img8.png" alt="$ \bf k$"> + <img width="16" height="35" align="MIDDLE" border="0" src="http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/img1.png" alt="$ \bf q$"> grid points used in the subsequent electron-phonon calculation"</div>
<div><br></div><div>I was wondering how we can make sure that the denser k-point grid contains both the k and k+q grid points? </div><div><br></div><div>Thank you.</div><div><br></div><div>Andy.</div></div>