The GW-BSE framework with exciton envelope modulation and sum-over-exciton-states expansion captures the frequency-dependent optical activity in alpha-quartz, where excitonic many-body effects are decisive over independent-particle approximations.
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\textit{Ab initio} \textit{GW}-BSE theory of optical activity in $\alpha$-quartz
The GW-BSE framework with exciton envelope modulation and sum-over-exciton-states expansion captures the frequency-dependent optical activity in alpha-quartz, where excitonic many-body effects are decisive over independent-particle approximations.