Abstract
The dependence of the lowest direct absorption gap E 0 of ZnTe on hydrostatic pressure has been measured at room temperature with a diamond anvil cell for pressures up to the second phase transition (11.9 ± 0.3 GPa). The energy gap E 0 (eV) = 2.27 + 10.4 · 10 -2 · P − 28 · 10 -4 · P 2 (P in GPa) exhibits a sublinear dependence on P up to the first phase transition at 9.4 + 0.3 GPa. However, if the gap is plotted as a function of the relative change of lattice constant (-Δa/a 0) it shows, within error, a linearity with E 0 (eV) = 2.266 + 16.2 (-Δa/a 0). The experimental results are compared to theoretical calculations based on a local empirical pseudopotential and with recently published ab initio LMTO calculations.
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