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Modulação acústica de éxcitons em semicondutores bidimensionais

Neste seminário, apresentado para o Departamento de Física da Universidade Federal do Ceará, mostramos alguns de nossos resultados recentes em experimentos de modulação acústica em semicondutores bidimensionais.  

Highlights of Fapesp´s Research News website

Our recently published manuscript (“Acoustically driven Stark effect in transition metal dichalcogenide monolayers“) has received one of the highlights of Fapesp´s Research News website in December 2021.  To read the article click HERE.

Surface acoustic waves for exciton manipulation in 2D materials

We employed Surface Acoustic Waves (SAWs) to manipulate excitonic states in MoSe2 and MoS2 monolayers (MLs), as illustrated in the figure below. By transferring the MLs to high dielectric constant LiNbO3 substrates, we have shown how the SAW strain and piezoelectric field modifies the light emission of neutral and negatively charged excitonic states (trions). As …

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Studying the optical properties of lanthanide-doped multi-shell nanoparticles

In collaboration with Prof. Fernando Sigoli (from the Institute of Chemistry) and other researchers, we contributed to the study of the emission properties of core-shell nanoparticles. We investigated nanoparticles with a cubic core containing DyIII ions and hexagonal shells where ErIII, YbIII and NdIII ions were distributed. We observed that these systems consistently show emission …

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Unpolarized light sources from rolled-up quantum wells (Destaque da SBPMat)

Our work, in collaboration with Prof. Christoph Deneke (IFGW),  Ângelo Malachias (UFMG), and Leonarde Nascimento (UFV), is one latest highlights of the Brazilian Materials Research Society (SBPMat).  To see the press release click HERE. We demonstrate how the strain state of a rolled-up InGaAs/GaAs quantum well can be employed to induce strong valence band mixing …

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