<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:14pt">Dear all,<br>In order to calculate the effective <span class="yshortcuts" id="lw_1341287288_0">plasma frequency</span> we need imaginary<br>part of dielectric function, as discussed in Phys. Rev. B 74, 014209<br>(2006). For different polarization, we have epsilon_2xx, epsilon_2yy<br>and epsilon_2zz, but the code dose not give explicitly the epsilon<br>itself.<br>Can we obtain the effective plasma frequency by using the following formula?<br>(epsilon_2)^2={(epsilon_2xx)^2+(epsilon_2xx)^2+(epsilon_2zz)^2}/3<br>Thanks in advance<br>S. Pourmasoud<br></div></body></html>