<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear all, <o:p></o:p></p><p class=MsoNormal>From the ‘user guide’ and some previous posts in forum, I see that the calculation of the e-p interaction coefficient in QE is available in metals only. <o:p></o:p></p><p class=MsoNormal>But I also found some papers which used QE package to calculate GaAs, Si, Ge, Graphene, etc, which are semiconductor or semimetal. <o:p></o:p></p><p class=MsoNormal>[PRL, 99, 236405, 2007 – GaAs, GaP, <a href="http://prl.aps.org/abstract/PRL/v99/i23/e236405">http://prl.aps.org/abstract/PRL/v99/i23/e236405</a> <o:p></o:p></p><p class=MsoNormal> Phys. of the Solid State, 51 1110 (2009) – Si, <a href="http://www.springerlink.com/content/c0g804860348r072/">http://www.springerlink.com/content/c0g804860348r072/</a> <o:p></o:p></p><p class=MsoNormal>PRB, 81, 121412(R) (2010), - Graphene, <a href="http://prb.aps.org/abstract/PRB/v81/i12/e121412">http://prb.aps.org/abstract/PRB/v81/i12/e121412</a> <o:p></o:p></p><p class=MsoNormal>PRB, 84, 035201 (2011) – Ge, <a href="http://prb.aps.org/abstract/PRB/v84/i3/e035201">http://prb.aps.org/abstract/PRB/v84/i3/e035201</a> ]<o:p></o:p></p><p class=MsoNormal>To do this calculation (e-p deformation potential for semiconductors), do we have to go inside the code? <o:p></o:p></p><p class=MsoNormal>Or can we calculate those materials (GaAs or Graphene) with the current version of QE? <o:p></o:p></p><p class=MsoNormal>Also, can we expect any possibility for higher order coupling (the second or higher order coupling, to see multi-phonon absorption or emission)?<o:p></o:p></p><p class=MsoNormal>Any comment or suggestion would be appreciated. Many Thanks in advance. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Seungha Shin<o:p></o:p></p><p class=MsoNormal>Heat Transfer Physics Laboratory, Mechanical Engineering<o:p></o:p></p><p class=MsoNormal>University of Michigan at Ann Arbor<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>