Valley polarization fluctuations, bistability, and switching in two-dimensional semiconductors
| العنوان: | Valley polarization fluctuations, bistability, and switching in two-dimensional semiconductors |
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| المؤلفون: | M. A. Semina, M. M. Glazov, C. Robert, L. Lombez, T. Amand, X. Marie |
| المصدر: | Physical Review B. 106 |
| بيانات النشر: | American Physical Society (APS), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Chaotic Dynamics (nlin.CD), Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Nonlinear Sciences - Chaotic Dynamics, Physics::Atmospheric and Oceanic Physics |
| الوصف: | We study theoretically nonlinear valley polarization dynamics of excitons in atom-thin semiconductors. The presence of significant polarization slows down valley relaxation due to an effective magnetic field resulting from exciton-exciton interactions. We address temporal dynamics of valley polarized excitons and study the steady states of the polarized exciton gas. We demonstrate bistability of the valley polarization where two steady states with low and high valley polarization are formed. We study the effects of fluctuations and noise in such system. We evaluate valley polarization autocorrelation functions and demonstrate that for a high-polarization regime the fluctuations are characterized by high amplitude and long relaxation time. We study the switching between the low- and high-valley polarized states caused by the noise in the system and demonstrate that the state with high valley polarization is preferential in a wide range of pumping rates. 11 pages, 6 figures |
| تدمد: | 2469-9969 2469-9950 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b6f225ad15f641ed3bf85dae2293374 https://doi.org/10.1103/physrevb.106.035302 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....6b6f225ad15f641ed3bf85dae2293374 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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