Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster Ib

HL 36.21: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Microscopic Theory of the Refractive Index — •Ronald Starke1 and Giulio Schober21TU Bergakademie Freiberg, Inst. f. theo. Phys — 2Uni. Heidelberg, Inst. f. theo. Phys

We re-examine the refractive index from the viewpoint of modern first-principles materials physics and find that the standard formula, n2 = єr µr, is downright wrong. Even worse, the allegedly approximate Maxwell relation, n2 = єr, which is being used for most practical purposes, can only be justified in the long-wavelength limit. In order to obtain the true wave-equation in materials, one instead has to start from the fundamental, Lorentz covariant electromagnetic wave-equation in terms of the proper response tensor. From this we prove a general theorem by which the electric field in materials is restricted to the kernel of the microscopic dielectric tensor thus elucidating the analogy to the theory of plasmons.

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