Exciton-exciton interaction in transition metal dichalcogenide monolayers and van der Waals heterostructures
| العنوان: | Exciton-exciton interaction in transition metal dichalcogenide monolayers and van der Waals heterostructures |
|---|---|
| المؤلفون: | Ermin Malic, Samuel Brem, Daniel Erkensten |
| المصدر: | Physical Review B |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Exciton, FOS: Physical sciences, 02 engineering and technology, Electron, 01 natural sciences, symbols.namesake, Condensed Matter::Materials Science, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Coulomb, 010306 general physics, Physics, Condensed Matter::Quantum Gases, Condensed Matter - Materials Science, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, Scattering, Condensed Matter::Other, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Transition metal dichalcogenide monolayers, 3. Good health, Dipole, symbols, van der Waals force, 0210 nano-technology, Excitation |
| الوصف: | Due to a strong Coulomb interaction, excitons dominate the excitation kinetics in 2D materials. While Coulomb-scattering between electrons has been well studied, the interaction of excitons is more challenging and remains to be explored. As neutral composite bosons consisting of electrons and holes, excitons show a non-trivial scattering dynamics. Here, we study on microscopic footing exciton-exciton interaction in transition-metal dichalcogenides and related van der Waals heterostructures. We demonstrate that the crucial criterion for efficient scattering is a large electron/hole mass asymmetry giving rise to internal charge inhomogeneities of excitons and emphasizing their cobosonic substructure. Furthermore, both exchange and direct exciton-exciton interactions are boosted by enhanced exciton Bohr radii. We also predict an unexpected temperature dependence that is usually associated to phonon-driven scattering and we reveal an orders of magnitude stronger interaction of interlayer excitons due to their permanent dipole moment. The developed approach can be generalized to arbitrary material systems and will help to study strongly correlated exciton systems, such as moire super lattices. 13 pages, 6 figures |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c87c77977a56dce5c4673b9c94fc4609 http://arxiv.org/abs/2006.08392 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....c87c77977a56dce5c4673b9c94fc4609 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |