Zn0.7Hg0.3Ga2Se4: a defect diamond-like selenide with a balanced band gap and nonlinear optical response.
Balancing wide band gaps with strong second-order nonlinear optical (NLO) responses remains a central challenge for infrared (IR) frequency-conversion materials. Here, we report a Zn/Hg co-occupied defect diamond-like (DDL) selenide, Zn0.7Hg0.3Ga2Se4, designed to address this trade-off through isovalent compositional r...