I believe that pwcond code in espresso, can do the job. I myself, wants to do the same for graphene properly as well. you can check the documentation here, it is based on Landauer-Buttiker formula: http://iramis.cea.fr/Pisp/alexander.smogunov/PWCOND/pwcond.html and here is the input file parameters: http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PWCOND.html
Karim Elgammal PhD student Materials- and Nanophysics KTH Sweden
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