<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1478876497723_3255">Dear QE Users</div><div id="yui_3_16_0_ym19_1_1478876497723_4929"><br></div><div id="yui_3_16_0_ym19_1_1478876497723_4931" dir="ltr">I 'm going to calculate the Phonon dispersion with Quantum ESPRESSO (version 6.0). The acoustic spectra consist of three branches which are transverse acoustic (TA), longitudinal acoustic (LA), and out-of-plane transverse acoustic (ZA).</div><div id="yui_3_16_0_ym19_1_1478876497723_5084" dir="ltr">I have two questions: <br></div><div id="yui_3_16_0_ym19_1_1478876497723_5139" dir="ltr">1- Does the dimension of Supercell for phono calculation determine by nq1, nq2,and nq3 in the phonon input file?</div><div id="yui_3_16_0_ym19_1_1478876497723_5210" dir="ltr">2- we know that the lowest three dispersion in the phonon spectra are the three acoustic branches, but how can I find which one is for TA, LA, and ZA? <br></div><div id="yui_3_16_0_ym19_1_1478876497723_5440" dir="ltr">thanks for your reply.</div><div id="yui_3_16_0_ym19_1_1478876497723_5438" dir="ltr">Best Regards</div><div id="yui_3_16_0_ym19_1_1478876497723_5439" dir="ltr">Ali<br></div></div></body></html>