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{wiki=Roger_Elliott_(physicist)}

= R. J. Elliott
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<Roger James Elliott> calculated how <excitons> alter <optical absorption> near a <semiconductor> <band gap>. Treating the electron-hole attraction with an <effective mass> model produces bound-state absorption lines as well as a modified continuum. The 1957 theory distinguishes direct and phonon-assisted indirect transitions, and shows how optical selection rules change the edge's shape and strength. It connects microscopic bound states with features visible in a measured absorption spectrum.<Intensity of Optical Absorption by Excitons by Roger James Elliott>[Physical Review 108, 1384 (1957), abstract: direct/indirect and allowed/forbidden edge transitions]{ref}

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 Roger James Elliott (source code)