Thank you ,Stefano! I have misinterpreted the meaning of effective mass. When we talk about NFE states, does it mean that such E-K dispersion should be held between 2 symmetry points, like from X-> Gamma ?
On Mon, Apr 28, 2008 at 1:40 AM, Stefano Baroni <baroni at sissa.it> wrote: > 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 > On Apr 27, 2008, at 8:27 AM, lan haiping wrote: > > Dear All, > > I am wondering about the nearly free electron states . To identify such > states, > does it mean that its effective mass is very close to free electron ,And > we can identify > it from bands' dispersion ? > > Bests > H.P > > -- > Hai-Ping Lan > Department of Electronics , > Peking University , Bejing, 100871 > lanhaiping at gmail.com, hplan at > pku.edu.cn_______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum > > > > > --- > Stefano Baroni - SISSA & DEMOCRITOS National Simulation Center - Trieste > [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype) > > La morale est une logique de l'action comme la logique est une morale de > la pens?e - Jean Piaget > > Please, if possible, don't send me MS Word or PowerPoint attachments > Why? See: http://www.gnu.org/philosophy/no-word-attachments.html > > > > > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum > > -- Hai-Ping Lan Department of Electronics , Peking University , Bejing, 100871 lanhaiping at gmail.com, hplan at pku.edu.cn -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20080430/f7dfef37/attachment.htm
