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question about the lesson response-function 1 (RF1)

Posted: Mon Aug 06, 2012 7:11 am
by Radhika
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

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

Posted: Mon Aug 06, 2012 2:29 pm
by jzwanzig
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.