Thank you ,Stefano!<br>I have misinterpreted the meaning of effective mass.<br>When we talk about NFE states, does it mean that such <br>E-K dispersion should be held between 2 symmetry points, like from X-> Gamma ?<br>
<br><div class="gmail_quote">On Mon, Apr 28, 2008 at 1:40 AM, Stefano Baroni <<a href="mailto:baroni@sissa.it">baroni@sissa.it</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="">The higher the energy, the lower the effect of the pseudopotential, so high-energy states are expected to be more free-electron like than low-lying ones. I am afraid that the very ocncept of "effective mass" is not very meaningful for these states. However, I would expect (although I have never verified) that for high-lying states the derivative of the band energy with respect to the wavenumber be linear with respect to the wavenumber, with the coefficient given by the inverse of the free-electron mass. SB<div>
<br><div><div><div></div><div class="Wj3C7c"><div>On Apr 27, 2008, at 8:27 AM, lan haiping wrote:</div><br></div></div><blockquote type="cite"><div><div></div><div class="Wj3C7c">Dear All,<br><br> I am wondering about the nearly free electron states . To identify such states,<br>
does it mean that its effective mass is very close to free electron ,And we can identify<br>it from bands' dispersion ? <br> <br> Bests<br>H.P<br clear="all"><br>-- <br>Hai-Ping Lan <br>Department of Electronics ,<br>
Peking University , Bejing, 100871<br></div></div><a href="mailto:lanhaiping@gmail.com" target="_blank">lanhaiping@gmail.com</a>, <a href="mailto:hplan@pku.edu.cn" target="_blank">hplan@pku.edu.cn</a> _______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Hai-Ping Lan <br>Department of Electronics ,<br>Peking University , Bejing, 100871<br><a href="mailto:lanhaiping@gmail.com">lanhaiping@gmail.com</a>, <a href="mailto:hplan@pku.edu.cn">hplan@pku.edu.cn</a>