Band structure and optical properties of germanium sheet polymers - art. no. 033311

The band structure of H-terminated Ge sheet polymers is calculated using de nsity-functional theory in the local density approximation and compared to the optical properties of epitaxial polygermyne layers as determined from r eflection, photoluminescence, and photoluminescence excitation measurements . A direct band gap of 1.7 eV is predicted and a near resonant excitation o f the photoluminescence is observed experimentally close to this energy.