Hi Robert,<div>Is there a way to include this somehow?</div><div>Thanks,</div><div>Martin</div><div><br><br><div class="gmail_quote">On Thu, Feb 4, 2010 at 9:44 AM, Robert Laskowski <span dir="ltr"><<a href="mailto:rolask@theochem.tuwien.ac.at">rolask@theochem.tuwien.ac.at</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi,<br>
you are missing interstitial contribution.<br>
<br>
regards<br>
<div><div></div><div class="h5"><br>
On Thursday 04 February 2010 09:36:53 Martin Gmitra wrote:<br>
> Dear Wien2k users,<br>
><br>
> We are interested in calculation of expectation value of spin for a state |n,k>,<br>
> where n is the band index and k is the wave vector. For this purpose we have<br>
> slightly modified lapwdm program. The problem we are encountering is that the<br>
> expectation value of z-component of Pauli matrix (sigma_z) is not equal one.<br>
> Let us assume for simplicity spin-up state |n,k> and no spin-orbit coupling.<br>
> The expectation value for sigma_z we calculate as<br>
><br>
> sum_a ( rho_{n,k,a} sigma_z ) not= 1 (it is smaller then 1, typical<br>
> range 0.6-0.9)<br>
><br>
> where sum_a is the summation over atoms in unit cell.<br>
><br>
> 1. Why we do not obtain for the state |n,k> expectation value equal one?<br>
> It is rather obvious that in this example <n,k| sigma_z |n,k> =1.<br>
><br>
> 2. What is the density matrix normalization in this case?<br>
><br>
> rho_{n,k,a} is in this simple example 2x2 matrix having only up-up component,<br>
> which is given as Trace in orbital subspaces (sum for L=0,1,2,3) of given state<br>
> |n,k>.<br>
><br>
> Many thanks in advance,<br>
> Martin<br>
><br>
> [We are running Wien2k v9.1]<br>
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><br>
><br>
<br>
<br>
<br>
--<br>
Dr Robert Laskowski<br>
<br>
Vienna University of Technology,<br>
Institute of Materials Chemistry,<br>
Getreidemarkt 9/165-TC, A-1060 Vienna<br>
<br>
tel. +43 1 58801 15675<br>
Fax +43 1 58801 15698<br>
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</blockquote></div><br></div>