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Spin dynamics and spin transport in reduced dimensions: from graphene to spin lasers

Grant number: 12/05618-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2012
Effective date (End): May 09, 2016
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Guilherme Matos Sipahi
Grantee:Paulo Eduardo de Faria Junior
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated scholarship(s):13/23393-8 - Tailoring spin-dependent and optical properties in semiconductor nanostrucures, BE.EP.DR


We propose to conduct a collaborative research that explores spin-dependent properties in systems with reduced dimensionality: from semiconductor quantum wells and quantum dots, to intrinsically two-dimensional graphene. The motivation for this effort, which will provide the core PhD thesis research for Mr. Paulo Eduardo de Faria Junior, is twofold. On the one hand the understanding of fundamental properties such as spin relaxation and spin transport is interesting by itself. Unlike charge, spin is a non-conserved quantity due to spin-orbit and hyperfine coupling which provides additional challenges to study spin relaxation and spin transport. Revealing the electronic structure in the systems of interest, comprised of Si, Ge, graphene, or III-V semiconductors, provides already important clues and guidance for many spin-dependent properties. On the other hand such knowledge of spin relaxation and spin transport could enable novel class of spin-devices and extend the possibilities for spintronic applications, typically limited to magnetoresistive effects. Specifically, this proposal will help to critically evaluate the feasibility of spin interconnects, magneto-logic gates, and spin lasers. The collaborative effort between the groups of Prof. Sipahi and Prof. Zutic in guiding the research of Mr. de Faria Junior and exposing him to a number of theoretical techniques, will be further enhanced by the active interaction with several other leading researchers in the field of spintronics who are directly interested in the proposed topics.

Scientific publications (6)
(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)
ZUTIC, IGOR; XU, GAOFENG; LINDEMANN, MARKUS; FARIA JUNIOR, PAULO E.; LEE, JEONGSU; LABINAC, VELIMIR; STOJSIC, KRISTIAN; SIPAHI, GUILHERME M.; HOFMANN, MARTIN R.; GERHARDT, NILS C. Spin -lasers: spintronics beyond magnetoresistance. Solid State Communications, v. 316, AUG 2020. Web of Science Citations: 0.
CAMPOS, TIAGO; FARIA JUNIOR, PAULO E.; GMITRA, MARTIN; SIPAHI, GUILHERME M.; FABIAN, JAROSLAV. Spin-orbit coupling effects in zinc-blende InSb and wurtzite InAs nanowires: Realistic calculations with multiband k center dot p method. Physical Review B, v. 97, n. 24 JUN 6 2018. Web of Science Citations: 14.
BASTOS, CARLOS M. O.; SABINO, FERNANDO P.; FARIA JUNIOR, PAULO E.; CAMPOS, TIAGO; DA SILVA, JUAREZ L. F.; SIPAHI, GUILHERME M. Stability and accuracy control of k center dot p parameters. Semiconductor Science and Technology, v. 31, n. 10 OCT 2016. Web of Science Citations: 4.
FARIA JUNIOR, PAULO E.; CAMPOS, TIAGO; BASTOS, CARLOS M. O.; GMITRA, MARTIN; FABIAN, JAROSLAV; SIPAHI, GUILHERME M. Realistic multiband k . p approach from ab initio and spin-orbit coupling effects of InAs and InP in wurtzite phase. Physical Review B, v. 93, n. 23 JUN 30 2016. Web of Science Citations: 17.
FARIA JUNIOR, PAULO E.; XU, GAOFENG; LEE, JEONGSU; GERHARDT, NILS C.; SIPAHI, GUILHERME M.; ZUTIC, IGOR. Toward high-frequency operation of spin lasers. Physical Review B, v. 92, n. 7 AUG 25 2015. Web of Science Citations: 26.
FARIA JUNIOR, P. E.; CAMPOS, T.; SIPAHI, G. M. Interband polarized absorption in InP polytypic superlattices. Journal of Applied Physics, v. 116, n. 19 NOV 21 2014. Web of Science Citations: 7.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
JUNIOR, Paulo Eduardo de Faria. Development and application of the k.p method to investigate spin and optical properties of semiconductor nanostructures. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Física de São Carlos São Carlos.

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