Report
A steady state approach for studying valley relaxation using optical vortex beam
| العنوان: | A steady state approach for studying valley relaxation using optical vortex beam |
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| المؤلفون: | Pattanayak, Aswini Kumar, Das, Pritam, Dhara, Avijit, Chakrabarty, Devarshi, Paul, Shreya, Gurnani, Kamal, Brundavanam, Maruthi Manoj, Dhara, Sajal |
| المصدر: | Nano Letters (2022) |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | Spin-valley coupling in monolayer transition metal dichalcogenides gives rise to valley polarization and coherence effect, limited by intervalley scattering caused by exciton-phonon, exciton-impurity, and electron-hole exchange interaction (EHEI). We explore an approach to tune the EHEI by controlling excitons center of mass momentum (COM) utilizing the photon distribution of higher-order optical vortex beam. By virtue of this, we have observed excitons COM-dependent valley depolarization and decoherence which gives us the ability to measure the timescale associated with valley dynamics in the steady-state measurement. Our steady-state technique to probe the valley dynamics can open up a new paradigm to explore the physics of excitons in two-dimensional systems. Comment: 25 pages, 5 Manuscript figures, 7 Supplementary figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1021/acs.nanolett.2c00824 |
| URL الوصول: | http://arxiv.org/abs/2202.10781 |
| رقم الانضمام: | edsarx.2202.10781 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1021/acs.nanolett.2c00824 |
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