question about the lesson response-function 1 (RF1)

Phonons, DFPT, electron-phonon, electric-field response, mechanical response…

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Radhika
Posts: 3
Joined: Thu Jun 28, 2012 8:51 am

question about the lesson response-function 1 (RF1)

Post by Radhika » Mon Aug 06, 2012 7:11 am

Dear All

I have a very small question about this tutorial.
Can this tutorial input file can be modified to run calculations of physical properties of semi-conductor because as this tutorial is for insulator?

Regards
Radhika

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jzwanzig
Posts: 504
Joined: Mon Aug 17, 2009 9:25 am

Re: question about the lesson response-function 1 (RF1)

Post by jzwanzig » Mon Aug 06, 2012 2:29 pm

Short answer: yes, because at zero kelvin (the default conditions of codes like abinit) semiconductors are insulators. Longer answer: the response function part of abinit works as follows: phonons for metals, semiconductors/insulators; strains for metals, semiconductors/insulators; electric field for semiconductors/insulators (the theory used for the electric field response assumes nonmetallic behavior). Also, norm-conserving pseudopotentials work for all the above perturbations, while PAW has only been coded for phonons and for electric field.
Josef W. Zwanziger
Professor, Department of Chemistry
Canada Research Chair in NMR Studies of Materials
Dalhousie University
Halifax, NS B3H 4J3 Canada
jzwanzig@gmail.com

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