Re: [Phonopy-users] amplitude of eigenmode

[Atsushi T. <atz...@gm...>]

Hi,

> Sir/Madam,
> In the description of eigenvector, it say "Cartesian axes in the primitive
> cell". What does it mean? Does it mean Cartesian axes or the
> \vec{a},\vec{b},\vec{c}?

Eigenvectors are obtained in Cartesian coordinates, and they are just
written into files in phonopy.

> What are the units used here? Is the amplitude of
> the eigenmode the modulus of the eigenvector?

The eigenvectors are calculated using numpy.linalg.eigh.
http://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.eigh.html
Each eigenvector is obtained as a column vector, and as written here,
the array of column eigenvectors is unitary.

Togo

>
> Thanks.
>
>
>
> Yundi
>
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-- 
Atsushi Togo
http://atztogo.users.sourceforge.net/
atz...@gm...