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Dynamics of charge carriers and spin in type-II antimonide nanostructures

Grant number: 22/08731-3
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): November 01, 2022
Effective date (End): October 31, 2026
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Marcio Daldin Teodoro
Grantee:Gabriel Marques Jacobsen
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil


Low-dimensional Nanostructures, such as quantum wells and dots, have received great attention from the scientific community over the last decades from the point of view of Basic and Applied Physics. On that perspective, recent improvements on growing antimony-based systems allowed the introduction of this element in the traditional III-V alloys, opening a wide range of new study possibilities. Among them, the type-II band alignment, where electrons and holes are spatially separated and yet poorly explored, stands out for providing results as long recombination time and the possibility of wavefunction engineering. Besides that, one intriguing effect of inserting Sb is its strong spin-orbit coupling which can yield to interesting spin phenomena and, consequently, become a great value for applications on quantum technologies. In order to get a combination between quantum well and dots properties, hybrid systems are grown which can lead to longer carrier lifetimes and larger and brighter photoluminescent emission and also allow surveys on spin injection processes. However, despite the high number of reports on the literature, the ones on systems composed by type-II nanostructures are limited. According to our preliminary simulations, this system may offer the possibility of tunneling from only one type of carrier depending on the structural parameters, which is an excellent opportunity for a full understanding of the tunneling process besides the several possible applications that may come from it. Hence, this PhD project is dedicated to investigate hybrid type-II nanostructures formed by antimonides in pursuance of analyzing the coupling nature and the effects of varying growing and external parameters, such as temperature and magnetic field, over the system. For that, this proposal is based on two approaches, optoelectronic studies and electronic structure simulations, whereas the samples are grown by our collaborators. Therefore, the outcomes of this thesis will comprehend thoroughly the carrier and spin dynamics on these poorly researched systems. (AU)

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