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Calculation of Optical Conductivity of YbB_<12> using Realistic Tight-binding Model

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Saitama University Cyber Repository of Academic Resources
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Abstract

Based on the previously reported tight-binding model fitted to the LDA+U band calculation, optical conductivity of the prototypical Kondo insulator YbB12 is calculated theoretically. Many-body effects are taken into account by the self-consistent second order perturbation theory. The gross shape of the optical conductivity observed in experiments are well described by the present calculation, including their temperature-dependences.

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