Berlin 2015 – scientific programme

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KR: Fachgruppe Kristallographie

KR 3: Poster Session on Ferroic Domain Walls - Multiferroics (DF jointly with KR, MA, TT)

KR 3.29: Poster

Monday, March 16, 2015, 19:00–21:00, Poster C

Ab initio expression of magneto-electric coupling coefficients in terms of current response function — •Ronald Starke¹ and Giulio Schober² — ¹Institut f. Theo. Physik, Bergakademie Freiberg — ²Institut f. Theo. Physik, Uni Heidelberg

Based on the Functional Approach to electrodynamics of media, we show that the Maxwell equations imply closed, analytical expressions of the magneto-electric coupling coefficients in terms of the current response functions. On the linear level, these expressions include all effects of inhomogeneity, anisotropy and relativistic retardation. Moreover, we relate the 36 component functions of the constitutive tensor used in the context of bi-anisotropic media to only 9 causal response functions which specify the current response to an external vector potential.