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[Xavier Gonze <gonze@pcpm.ucl.ac.be>]

Dear Hua,

On 20 Jun 2007, at 04:33, hbao@purdue.edu wrote:

Dear all,

I am interested in calculating the energy level using TDDFT. I know that abinit is able to do TDDFT at calculate gamma point. How about periodic systems? Is TDDFT implement for k-points in abinit?

TDDFT with LDA and RPA kernels does not change the band edges of the periodic solids. 

It is a fundamental problem with this approach when it comes to applications to solids. 

In ABINIT, the Casida framework is implemented, and in 

this framework, TDDFT for periodic solid is useless, giving the same results as straight DFT,

so we did not care about the non-Gamma case. 

Myrta Gruening worked recently on this topics with me, and she will send you a preprint of ours

when ready.

TDDFT might be useful for solids in other contexts, though. See :

Onida G, Reining L, Rubio A

Electronic excitations: density-functional versus many-body Green's-function approaches 

REVIEWS OF MODERN PHYSICS 74 (2): 601-659 APR 2002 

and/or

Botti S, Schindlmayr A, Del Sole R, et al.

Time-dependent density-functional theory for extended systems 

REPORTS ON PROGRESS IN PHYSICS 70 (3): 357-407 MAR 2007 

Xavier