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Phenomena of oscillation in magnetotransporte in triple quantum wells

Grant number: 08/09566-9
Support type:Regular Research Grants
Duration: February 01, 2009 - May 31, 2011
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Gennady Gusev
Grantee:Gennady Gusev
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The main objective of the project is to study phenomena of oscillation in magnetotransporte in triple quantum wells. Triple quantum wells, or tri-layered systems, consisting of three quantum wells (simple) separated by two barriers of tunneling. The Landau quantization of the electronic states are presented as oscillations various amounts of physical function as the magnetic field applied. Variations in the magnetoresistency solid belongs to the most essential quantum phenomenon of this kind. Recently new magnetic fluctuations in inter-subanda resistivity linear double quantum wells were observed and examined in our laboratory [1]. It also reported a new kind of resonance in magnetoresistência induced by microwave, caused by the absorption of electromagnetic waves with frequencies combined D Tk kh w c [2]. We plan for this proposal systematic study of transport in quantum wells triple in the presence of both the magnetic fields perpendicular as parallel; applied electric fields weak and strong, and implementation of the microwave radiation. The main focus of this proposal is the optimization of conditions for the growth of such materials and manufacture of structures, wells triple with the possibility of manipulating the gap of tunneling into electric field and a magnetic field tilted and the search for new magnetic fluctuations and quantum effects. The benefits of this project for Brazil are developing techniques for the growth necessary to obtain triple quantum wells of high quality and possible application of this knowledge (its consequences) in future devices. (AU)