The pressure dependence of the elastic constants associated with the fundamental band gap of beryllium chalcogenides has been studied by the state-of-the-art of Density Functional Theory. The resulting values of C i j were found to be strongly dependent on pressure. The fundamental band gap transition which occurs between Γ and X directions was found to shift linearly towards lower energy with increasing pressure, and yields a linear pressure coefficient of −22.7 (−25.85, −35.4) meV/GPa for BeS (BeSe, BeTe). …
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