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DFTB+ is a fast and efficient versatile quantum mechanical simulation software package . DFTB+ relies on the tight-binding approximation of density functional theory to gain around two orders of magnitude in simulation speed.
We have relied on DFTB+ for simulation of nanomaterial synthesis in plasmas, see e.g. [2,3].
 L. Han, P. Krstic, I. Kaganovich, and R. Car, "Migration of a carbon adatom on a charged single-walled carbon nanotube", Carbon 116, 174 (2017)
 I. D. Kaganovich, A. Khrabry, B. Greenberg, S. Ethier, A. Pineda, S. Yatom, Y. Raitses, “Root Growth of Carbon and Boron Nitride Nanotubes in Plasma of High-Pressure Arc”, https://www.ispc-conference.org/ispcproc/ispc24/251.pdf