We provide Tkwant as free software under a BSD license as a service to the physics community. If you have used Tkwant for work that has lead to a scientific publication, we kindly ask you to cite the main paper that introduces Tkwant:

T. Kloss, J. Weston, B. Gaury, B. Rossignol, C. Groth and X. Waintal, Tkwant: a software package for time-dependent quantum transport, arXiv:2009.03132 [cond-mat.mes-hall].