[Pw_forum] Re: Calculating generalized susceptibility with PWscf

[Stefano Baroni]

Hi Derek: that looks like the "kinematic" part of a susceptibility  
(i.e. a susceptibility with all the matrrix elements set equal to  
one). I do not think that anyting similar is already calculated  
anywhere in Quantum ESPRESSO. It would be good to have it! Thanks -  
Stefano

On Sep 27, 2006, at 10:20 PM, stewart at cnf.cornell.edu wrote:

> Chi(q) = \Sum_{ij,k} \frac{f(\eta_{k,i})[1-f(\eta_{k+q,j})]} {\eta_ 
> {k+q,j - \eta_{k,i}}

---
Stefano Baroni - SISSA  &  DEMOCRITOS National Simulation Center -  
Trieste
[+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype)

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