Above-bandgap ordinary optical properties of GaSe single crystal
نویسندگان
چکیده
We report above-bandgap ordinary optical properties of -phase GaSe single crystal. Reference-quality pseudodielectric function E = 1 E + i 2 E and pseudorefractive index N E = n E + i k E spectra were measured by spectroscopic ellipsometry from 0.73 to 6.45 eV at room temperature for the light polarization perpendicular to the optic axis E ĉ . The spectrum exhibited several interband-transition critical-point structures. Analysis of second-energy derivatives calculated numerically from the measured data yielded the critical-point energy values. © 2009 American Institute of Physics. doi:10.1063/1.3211967
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