<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:14px"> <div id="yui_3_16_0_ym19_1_1483868968118_3216" style="color: rgb(0, 0, 0); font-size: 13px;">Dear Prof. Peter Blaha,</div><div id="yui_3_16_0_ym19_1_1483868968118_3217" style="color: rgb(0, 0, 0); font-size: 13px;">Thank you for your reply and the valuable comment. I intend to use the Berry phase approach for a polar metal. But unfortunately, if the bands cross the Fermi level, the current Berry phase approach fails. Thus, If I can separate the bands into non-crossing (or better to say non-tuching bands) and crossing bands, then I try to overcome the problem. In this case, I can find the Berry phase for the non-crossing bands by the current approach as implemented in the WIEN2k code. For the bands that cross the Fermi surface I would use another strategy like something that is described in the following paper: <a id="yui_3_16_0_ym19_1_1483868968118_3218" href="http://www.nature.com/articles/ncomms11211" target="_blank" data-saferedirecturl="https://www.google.com/url?hl=en&q=http://www.nature.com/articles/ncomms11211&source=gmail&ust=1483955159933000&usg=AFQjCNG6no4LGTLP108aaTy8fsdslX6AAg"><font id="yui_3_16_0_ym19_1_1483868968118_3219" color="#1155cc">http://www.nature.com/a<wbr id="yui_3_16_0_ym19_1_1483868968118_3220"></font>rticles/ncomms11211</a>).</div><div id="yui_3_16_0_ym19_1_1483868968118_3221" style="color: rgb(0, 0, 0); font-size: 13px;">But, I am not sure whether separating the bands are physically correct or not, since I am changing the band structure by hand which may be not permitted.</div><div id="yui_3_16_0_ym19_1_1483868968118_3222" style="color: rgb(0, 0, 0); font-size: 13px;">Regards,</div><div id="yui_3_16_0_ym19_1_1483868968118_3224" style="color: rgb(0, 0, 0); font-size: 13px;" dir="ltr">Shahrebano Rahimi.</div></div></body></html>