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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Faraday rotation by the undisturbed bulk and by photoinduced giant polarons in EuTe

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Henriques, A. B. [1] ; Usachev, P. A. [1, 2]
Total Authors: 2
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil
[2] Ioffe Inst, St Petersburg 194021 - Russia
Total Affiliations: 2
Document type: Journal article
Source: Physical Review B; v. 96, n. 19 NOV 27 2017.
Web of Science Citations: 4

A quantum mechanical model is developed for the Faraday effect in europium telluride, for photons of energy within the transparency gap. The model is based on the well known band edge electronic energy states in EuTe. A concise expression for the Verdet constant is obtained, determined by few parameters already available in the literature. The Verdet constant adopted here, defined by the ratio between the Faraday rotation angle and the magnetization, is in effect temperature independent. Its dependence on the photon energy and applied magnetic field is in excellent agreement with published results. Below 3 T the Verdet constant is also nearly independent on field, but above 3 T at low temperatures it increases due to the band gap redshift. The model is used to calculate the photoinduced Faraday rotation associated with photoinduced giant magnetic polarons in EuTe. The theoretical photoinduced Faraday rotation excitation describes quite well the main features seen experimentally. Due to the common band-edge electronic energy structure, the model reported here could be extended to all other europium chalcogenides. (AU)

FAPESP's process: 16/24125-5 - Optical control of magnetism in semiconductors in the ultrafast time scale
Grantee:Andre Bohomoletz Henriques
Support type: Regular Research Grants