Optical control of magnetism in semiconductors in the ultrafast time scale

• Grant number: 16/24125-5
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2017
• End date: March 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Andre Bohomoletz Henriques
• Grantee: Andre Bohomoletz Henriques
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Changing the magnetic state of matter at will and in the ultrashort time scale is a subject of vast contemporary interest. In this project we shall investigate the optical control of magnetism in a variety of semiconductor materials. Light will be used both to induce as well as to monitor the magnetic state. We shall investigate the steady magnetism, as well as the transient one, using optical pulses, with a time resolution in the femtosecond scale. The materials to be investigated are (1) intrinsic magnetic semiconductors (EuO, EuSe and EuTe); (2) negatively charged InGaAs/GaAs quantum dots; (3) mixed cation organic-inorganic perovskites, which is a strategic material for solar cell applications. All samples will be supplied by the best specialists worldwide (UNICAMP, INPE, Ioffe/Russia, Linz/Austria and Eindhoven/The Netherlands). Experiments will be performed at he Magneto-Optics Laboratory, at the University of Sao Paulo. In this project, funds are requested for consumables, for a laser modulator required for some of the time resolved experiments, and for support of a three months visit of a scientist from Ioffe, who will participate in the experiments and interpretations. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

HENRIQUES, A. B.; USACHEV, P. A.. Faraday rotation by the undisturbed bulk and by photoinduced giant polarons in EuTe. Physical Review B, v. 96, n. 19, NOV 27 2017. (16/24125-5)

VAN KOOTEN, S. C. P.; USACHEV, P. A.; GRATENS, X.; NAUPA, A. R.; CHITTA, V. A.; SPRINGHOLZ, G.; HENRIQUES, A. B.. Converting Faraday rotation into magnetization in europium chalcogenides. Journal of Applied Physics, v. 126, n. 9, SEP 7 2019. (16/24125-5)

HENRIQUES, A. B.; USACHEV, P. A.. Faraday rotation by the undisturbed bulk and by photoinduced giant polarons in EuTe. PHYSICAL REVIEW B, v. 96, n. 19, p. 8-pg., 2017-11-27. (16/24125-5)