Crystal structures with two sublattice pairs per primitive cell can host so-called dark states which interact minimally with light due to destructive interference. Here, the authors reveal that in the semiconductor (NbSe4)3I these states lead to an indirect-gap optical behavior, despite the band structure displaying an almost direct band gap, having significant impact on its optoelectronic properties.
- Jiabao Yang
- Mihir Date
- Niels B. M. Schröter
