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Anomalous refraction of backward waves in ferromagnet–semiconductor superlattices in the presence of an external magnetic field
Author(s) -
Tarkhanyan Roland H.,
Niarchos Dimitris G.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743071
Subject(s) - superlattice , condensed matter physics , metamaterial , refractive index , permittivity , anisotropy , negative refraction , refraction , magnetic field , ferromagnetism , physics , electromagnetic radiation , optics , dielectric , optoelectronics , quantum mechanics
Features of anomalous refraction of electromagnetic waves in a semiconductor–ferromagnet superlattice are investigated in the presence of an external magnetic field which is parallel to the optical axis of the superlattice. Effective permittivity and permeability tensors are obtained using the method of anisotropic homogeneous medium. General conditions are found at which the structure behaves as a left‐handed negative‐index metamaterial. Field structure of the waves is found and frequency regions are studied at which the medium is described by negative group refractive index. It is shown that main properties of the refracted waves, in particular, the number of the backward bulk modes and the width of the frequency regions with anomalous refraction can be changed using the external magnetic field as tuning parameter. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)