Out-of-plane orientation of luminescent excitons in two-dimensional indium selenide
| Autor: | Alejandro Molina-Sanchez, Brian D. Gerardot, Raphaël Picard, Mauro Brotons-Gisbert, Artur Branny, Juan F. Sánchez-Royo, Daniel Andres-Penares, Raphaël Proux |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Photoluminescence Electronic properties and materials Exciton Science General Physics and Astronomy chemistry.chemical_element Physics::Optics 02 engineering and technology Two-dimensional materials 7. Clean energy General Biochemistry Genetics and Molecular Biology Article Crystal 03 medical and health sciences symbols.namesake Condensed Matter::Materials Science Physics::Atomic and Molecular Clusters Physics::Atomic Physics lcsh:Science Multidisciplinary business.industry Condensed Matter::Other General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Dipole 030104 developmental biology Semiconductor chemistry symbols Optoelectronics lcsh:Q van der Waals force Photonics 0210 nano-technology business Indium |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-10 (2019) |
| ISSN: | 2041-1723 |
| Popis: | Van der Waals materials offer a wide range of atomic layers with unique properties that can be easily combined to engineer novel electronic and photonic devices. A missing ingredient of the van der Waals platform is a two-dimensional crystal with naturally occurring out-of-plane luminescent dipole orientation. Here we measure the far-field photoluminescence intensity distribution of bulk InSe and two-dimensional InSe, WSe2 and MoSe2. We demonstrate, with the support of ab-initio calculations, that layered InSe flakes sustain luminescent excitons with an intrinsic out-of-plane orientation, in contrast with the in-plane orientation of dipoles we find in two-dimensional WSe2 and MoSe2 at room-temperature. These results, combined with the high tunability of the optical response and outstanding transport properties, position layered InSe as a promising semiconductor for novel optoelectronic devices, in particular for hybrid integrated photonic chips which exploit the out-of-plane dipole orientation. Room temperature photoluminescence of most 2D van der Waals semiconductors originate from in-plane dipoles. Here, the authors report a combination of far-field photoluminescence measurements and ab-initio calculations to demonstrate that 2D-InSe flakes sustain luminescent excitons with an intrinsic out-of-plane orientation. |
| Databáze: | OpenAIRE |
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