DFT	Density Functional Theory
$\alpha$-C	$\alpha$-cristobalite
$\alpha$-Q	$\alpha$-quartz
a-SiO${}_2$	Amorphous silicon dioxide
CT	Charge transition
ODC	Oxygen deficient center
EPR	Electron paramagnetic resonance
Opal-CT	Opal cristobalite tridymite
LDA	Local density approximation
GTH	Goedecker-Teter-Hutter
BFGS	Broyden–Fletcher–Goldfarb–Shanno
XC	Exchange-correlation
PBE	Perdew-Burke-Ernzerhof
ADMM	Auxiliary density matrix method
TD-DFT	Time-dependent density functional theory
TC-LRC	Truncated coulomb long-range correction
NEB	Nudged elastic band
CI-NEB	Climbing image nudged elastic band
GGA	Generalized gradient approximation
HSE	Heyd-Scuseria-Ernzerhof
VB	Valence band
CB	Conduction band
CBM	Conduction band minimum
CTL	Charge transition level
TS	Transition state
OA	Optical absorption
AE	all-electron