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The disadvantage of BaBiO$_3$ of not being a topological insulator despitehaving symmetry protected Dirac state is overcome by shifting the Fermi level(E$_F$) via fluorination. The DFT calculations reveal that the fluorinationneither affects the spin-orbit coupling nor the parity of the states, but itacts as a perfect electron donor to shift the E$_F$. We find that 33 %fluorination is sufficient to shift the E$_F$ by $\sim$ 2 eV so that theinvariant Dirac state lies on it to make BaBiO$_2$F a topological insulator.The fluorinated cubic compound can be experimentally synthesized as the phononstudies predict dynamical stability above $\sim$ 500 K. Furthermore, the Diracstates are found to be invariant against the low-temperature phase latticedistortion which makes the structure monoclinic. The results carry practicalsignificance as they open up the possibility of converting the family ofsuperconducting oxides, ABiO$_3$ (A = Na, K, Cs, Ba, Sr, Ca), to realtopological insulator through appropriate fluorination.

Shifting of Fermi Level and Realization of Topological Insulating Phase in the Oxyfluoride BaBiO$_2$F