Spin effects in InAs self-assembled quantum dots

Santos, Ednilson Carlos dos; Gobato, Y. Galvão; Brasil, M. J. S. P.; Taylor, David A.; Henini, M.

doi:10.1186/1556-276x-6-115

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…In Central America, R. prolixus was first reported in 1915 from the city of San Salvador [ 4 ], from where it subsequently spread in El Salvador and into Guatemala, Honduras, Nicaragua, Costa Rica, and southern Mexico. It is believed that the original specimens in San Salvador resulted from a "laboratory accident".…”

Section: Introductionmentioning

confidence: 99%

Elimination of Rhodnius prolixus in Central America

Hashimoto¹,

Schofield

2012

Parasites Vectors

126

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Rhodnius prolixus is one of the main vectors of Trypanosoma cruzi, causative agent of Chagas disease. In Central America, it was first discovered in 1915 in El Salvador, from where it spread northwest to Guatemala and Mexico, and southeast to Nicaragua and Costa Rica, arriving also in Honduras in the late 1950s. Indoor residual spraying (IRS) by the antimalaria services of Costa Rica prevented its spread southwards, and similar IRS programmes appear to have eliminated it from El Salvador by the late 1970s. In 1997, by resolution of the Ministers of Health of the seven Central American countries, a multinational initiative against Chagas disease (IPCA) was launched with one of the specific objectives being the elimination of R. prolixus from the region. As a result, more and more infested areas were encountered, and progressively sprayed using an IRS strategy already deployed against Triatoma infestans in the southern cone countries of South America. In 2008, Guatemala became the first of these countries to be formally certified as free of Chagas disease transmission due to R. prolixus. The other infested countries have since been similarly certified, and none of these has reported the presence of R. prolixus since June 2010. Further surveillance is required, but current evidence suggests that R. prolixus may now been eliminated from throughout the mesoamerican region, with a corresponding decline in the incidence of T. cruzi infections.

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Section: Introductionmentioning

confidence: 99%

Elimination of Rhodnius prolixus in Central America

Hashimoto¹,

Schofield

2012

Parasites Vectors

126

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“…In addition, it was evidenced the formation of highly spin-polarized two dimensional (2D) 3 gases under high magnetic fields which are responsible for spin polarized injection of carriers into the quantum well (QW) of the RTDs 11 .The formation of excitonic complexes in RTDs at hole and electron resonant tunneling condition was also demonstrated 12,18 . The physical properties of RTDs containing selfassembled InAs quantum dots (QDs) were also investigated [13][14][19][20][21][22] . It was shown that the spin polarization of an ensemble of QDs can also be voltage and light controlled due to the changes of charge state of QDs by an applied voltage, particularly at resonant tunneling condition [13][14] .…”

Section: Introductionmentioning

confidence: 99%

“…The physical properties of RTDs containing selfassembled InAs quantum dots (QDs) were also investigated [13][14][19][20][21][22] . It was shown that the spin polarization of an ensemble of QDs can also be voltage and light controlled due to the changes of charge state of QDs by an applied voltage, particularly at resonant tunneling condition [13][14] . However, there is no study of optical and spin properties of ensemble of InGaAs QRs in RTDs which could be an interesting system to evidence voltage controlled AB effects.…”

Section: Introductionmentioning

confidence: 99%

“…Resonant tunneling diodes (RTDs) have also been a research focus for many years [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . Several works investigated their fundamental physical properties and possible potential applications in spintronics [8][9][10][11][12][13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

“…Several works investigated their fundamental physical properties and possible potential applications in spintronics [8][9][10][11][12][13][14][15][16][17] . For example, it was shown that spin polarization of carriers in RTDs can be voltage and light dependent under magnetic field [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

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Spin Polarization of Carriers in InGaAs Self-Assembled Quantum Rings Inserted in GaAs-AlGaAs Resonant Tunneling Devices

Gordo

Gobato

Galeti

et al. 2017

Journal of Elec Materi

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In this work, we have investigated transport and polarization resolved photoluminescence (PL) of n-type GaAs-AlGaAs resonant tunneling diodes (RTDs) containing a layer of InGaAs self-assembled quantum rings (QRs) in the quantum well (QW). All measurements were performed under applied voltage, magnetic fields up to 15 T and using linearly polarized laser excitation. It was observed that the QRs' PL intensity and the circular polarization degree (CPD) oscillate periodically with applied voltage under high magnetic fields at 2 K. Our results demonstrate an effective voltage control of the optical and spin properties of InGaAs QRs inserted into RTDs.

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