Supernonlinear Shifts of Optical Energy Gaps in InSe and GaSe under Hydrostatic Pressure

概要

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Fundamental absorption spectra have been measured in layer compounds InSe andGaSe under hydrostatic pressure up to 4 GPa. The first and the second direct edges ex-hibit extremely nonlinear behaviors: The energy gap at the former edge decreasesfirst, takes a minimum at 0.5 GPa in InSe and at l . 1 GPa in GaSe, and then increaseswith pressure, while that of the latter increases monotonically over the whole pressurerange examined. Hydrostatic deformation potentials for respective absorption edgeshave been deduced on the basis of these results. Such anomalous behaviors of energygaps have been found to arise from competitions between the nonlinear variation ofthe van der Waals gap and linear variations of intralayer bondings. Several essentialaspects of the band structure have been clarified in terms of the hydrostatic deforma-lion potenticals thus deduced.
社団法人日本物理学会の論文
1986-02-15