Solid-state optical absorption from optimally tuned time-dependent range-separated hybrid density functional theory

Sivan Refaely-Abramson, Manish Jain, Sahar Sharifzadeh, Jeffrey B. Neaton, Leeor Kronik

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ملخص

We present a framework for obtaining reliable solid-state charge and optical excitations and spectra from optimally tuned range-separated hybrid density functional theory. The approach, which is fully couched within the formal framework of generalized Kohn-Sham theory, allows for the accurate prediction of exciton binding energies. We demonstrate our approach through first principles calculations of one- and two-particle excitations in pentacene, a molecular semiconducting crystal, where our work is in excellent agreement with experiments and prior computations. We further show that with one adjustable parameter, set to produce the known band gap, this method accurately predicts band structures and optical spectra of silicon and lithium fluoride, prototypical covalent and ionic solids. Our findings indicate that for a broad range of extended bulk systems, this method may provide a computationally inexpensive alternative to many-body perturbation theory, opening the door to studies of materials of increasing size and complexity.

اللغة الأصليةالإنجليزيّة
رقم المقال081204(R)
عدد الصفحات6
دوريةPhysical Review B (Condensed Matter and Materials Physics)
مستوى الصوت92
رقم الإصدار8
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 26 أغسطس 2015

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