Tip-Induced and Electrical Control of the Photoluminescence Yield of Monolayer WS2

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Pena Roman, Ricardo Javier ; Bretel, Remi ; Pommier, Delphine ; Lopez, Luis Enrique Parra ; Lorchat, Etienne ; Boer-Duchemin, Elizabeth ; Dujardin, Gerald ; Borisov, Andrei G. ; Zagonel, Luiz Fernando ; Schull, Guillaume ; Berciaud, Stephane ; Le Moal, Eric

• Tipo de documento: Artigo Científico
• Fonte: Nano Letters; v. 22, n. 23, p. 8-pg., 2022-12-14.

Resumo

The photoluminescence (PL) of monolayer tungsten disulfide (WS2) is locally and electrically controlled using the nonplasmonic tip and tunneling current of a scanning tunneling microscope (STM). The spatial and spectral distribution of the emitted light is determined using an optical microscope. When the STM tip is engaged, short-range PL quenching due to near-field electromagnetic effects is present, independent of the sign and value of the bias voltage applied to the tip-sample tunneling junction. In addition, a bias-voltage-dependent long-range PL quenching is measured when the sample is positively biased. We explain these observations by considering the native n-doping of monolayer WS2 and the charge carrier density gradients induced by electron tunneling in micrometer-scale areas around the tip position. The combination of wide-field PL microscopy and charge carrier injection using an STM opens up new ways to explore the interplay between excitons and charge carriers in two-dimensional semiconductors. (AU)

• Processo FAPESP: 20/12480-0 - Emissão de fótons individuais a partir de defeitos pontuais e hot spots induzidos pelo substrato em semicondutores bidimensionais: um estudo via luminescência induzida em microscopia de varredura de tunelamento
• Beneficiário: Ricardo Javier Peña Román
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 14/23399-9 - Heteroestruturas em nanofios semicondutores: emissores de luz nanométricos estudados por microscopia de varredura de tunelamento
• Beneficiário: Luiz Fernando Zagonel
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 18/08543-7 - Emissão de luz por defeitos em materiais bidimensionais
• Beneficiário: Ricardo Javier Peña Román
• Modalidade de apoio: Bolsas no Brasil - Doutorado