Título:
Optical characterization of defects in 2D materials
Coloquialista:
Bruno R. Carvalho (Departamento de Física, Universidade Federal do Rio Grande do Norte)
Resumo:
To understand and control the properties of most functional materials requires access to the structure and particles that define the microscopic interactions in these materials. To gain the desired understanding with simultaneous spectroscopic specificity we probe electron, phonon and defects in semiconducting 2D materials with different optical, including Raman, photoluminescence, and nonlinear spectroscopies. We show how we can probe the electronic and vibrational properties associated to defects through Raman and photoluminescence spectroscopy [1-3]. Also, locating and imaging defects in a material is a key challenge to examine the material’s quality for different target applications. We show how nonlinear optical dark-field microscopy can accurately probe 1D defects embedded into semiconducting monolayer dichalcogenides in a quick way [4]. This technique enhances the light-matter interaction by imaging the local profile of these defects. These results highlight the general applicability of the optical spectroscopy to unveil the underlying physics and emerging techniques to image 1D objects in 2D materials.
[1] Physical Review Letters 114, 136403 (2015).
[2] Nature Communications 8, 14670 (2017).
[3] Science Advances 3, e1602813 (2017).
[4] Nano Letters 20, 284 (2020).
Data, horário e local:
12 de fevereiro de 2021, (sexta-feira) 16h
Ambiente Virtual: Google Meet
Segue endereço do Webinar:
https://meet.google.com/wwv-mmav-wno
Orientações:
1. Entrar com o microfone desligado.
2. Entrar de preferência logado com o novo email institucional (@ufpe.br)
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