Dear Q. E developers,<br>I am working with Esperesso and other DFT codes like SIESTA. Although the DFT methods are quite reliable but they are expensive for many users. One of the solution is to fit the DFT and tight-binding results of small structures and obtain the tight-binding parameters. These parameters could be very helpful in the calculation of bigger structures. For example, the calculation of Graphene parameters can lead us to CNT,GNR and other structures. The number of fitted parameters and considered bands can be large enough to produce a very good agreement between the DFT and TB. <br>
Our team worked on this subject and we are ready for contribution with QE.<br><br>Best Reagrds,<br>-- <br><div>Mohsen Modarresi, </div>
<div>PhD student of Solid State Physics, Ferdowsi University of Mashhad, Iran.<br>Phone +98-9133452131</div><br>