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    Time-dependent density-functional approach for exciton binding energies

    Turkowski, V.
    Leonardo, Aritz L.
    Ullrich, Carsten A.
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    [PDF] TimeDependentDensityFunctionalApproach.pdf (111.3Kb)
    Date
    2009
    Format
    Article
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    Abstract
    Optical processes in insulators and semiconductors, including excitonic effects, can be described in principle exactly using time-dependent density-functional theory (TDDFT). Starting from a linearization of the TDDFT semiconductor Bloch equations in a two-band model, we derive a simple formalism for calculating exciton binding energies. This formalism leads to a generalization of the standard Wannier equation for excitons, featuring a nonlocal effective electron-hole interaction determined by long-range and dynamical exchange-correlation (XC) effects. We calculate exciton binding energies in several direct-gap semiconductors using exchange-only and model XC kernels.
    URI
    http://hdl.handle.net/10355/7575
    Citation
    Phys. Rev. B 79, 233201 (2009)
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