  Quantum technologies like single photon emitters and qubits can be enabled by
point defects in semiconductors, with the NV-center in diamond being the most
prominent example. There are many different semiconductors, each potentially
hosting interesting defects. The symmetry properties of the point defect
orbitals can yield useful information about the behavior of the system, such as
the interaction with polarized light. We have developed a tool to perform
symmetry analysis of point defect orbitals obtained by plane-wave density
functional theory simulations. The software tool, named ADAQ-SYM, calculates
the characters for each orbital, finds the irreducible representations, and
uses selection rules to find which optical transitions are allowed. The
capabilities of ADAQ-SYM are demonstrated on several defects in diamond and
4H-SiC. The symmetry analysis explains the different zero phonon line (ZPL)
polarization of the hk and kh divacancies in 4H-SiC.
