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Dear Pang Rui,
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<div class="">The projections consist of an s-like function on each C-C bond and a pz-like function on each C atom whose axis points in the radial direction of the nanotube. This is based on chemical intuition of what the Wannier functions for this system should
look like. Note that in this example the valence bands (sigma and pi character) plus low-lying conduction bands (also pi character) are being wannierised.</div>
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<div class="">Hope this helps.</div>
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<div class="">Arash</div>
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<div class="">—</div>
<div class="">Dr Arash Mostofi — <a href="http://www.mostofigroup.org" class="">www.mostofigroup.org</a></div>
<div class="">Reader in Theory and Simulation of Materials</div>
<div class="">Imperial College London</div>
<div class="">Director, Thomas Young Centre @Imperial</div>
<div class="">Warden, Wilkinson & Weeks Hall</div>
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<div class="">On 26 May 2015, at 09:53, 庞瑞(PANG Rui) <<a href="mailto:pang.r@sustc.edu.cn" class="">pang.r@sustc.edu.cn</a>> wrote:</div>
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<div class="">Dear all</div>
<div class="">I found in the exampel15, the projection part was write in a very complex way. Could someone tell me why it was written like that? How were those values decided?</div>
<div class="">Thanks.</div>
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