  The identification of novel multifunctional Dirac materials has been an
ongoing effort. In this connection quasi 2-dimensional (BEDT-TTF)-based charge
transfer salts are widely discussed. Here, we report about the electronic
structure of $\alpha$-(BEDT-TTF)$_2$I$_3$ and $\kappa$-(BEDT-TTF)$_2$I$_3$
under a hypothetical substitution of iodine with the halogens bromine, chlorine
and fluorine. The decreasing size of the anion layer corresponds to applying
chemical strain which increases tremendously in the case of
(BEDT-TTF)$_2$F$_3$. We performed structural optimization and electronic
structure calculations in the framework of density functional theory,
incorporating, first, the recently developed strongly constrained and
appropriately normed semilocal density functional SCAN, and, second, van der
Waals corrections to the PBE exchange correlation functional by means of the
dDsC dispersion correction method. In the case of $\alpha$-(BEDT-TTF)$_2$F$_3$
the formation of over-tilted Dirac-type-II nodes within the quasi 2-dimensional
Brillouin zone can be found. For $\kappa$-(BEDT-TTF)$_2$F$_3$, the recently
reported topological transition within the electronic band structure cannot be
revealed.
