Projects per year
Abstract
Breaking the space-time symmetries in materials can markedly influence their electronic and optical properties. In 3R-stacked transition metal dichalcogenides, the explicitly broken inversion symmetry enables valley-contrasting Berry curvature and quantization of electronic angular momentum, providing an unprecedented platform for valleytronics. Here, we study the valley coherence of 3R WS2 large single-crystal with thicknesses ranging from monolayer to octalayer at room temperature. Our measurements demonstrate that both A and B excitons possess robust and thickness-independent valley coherence. The valley coherence of direct A (B) excitons can reach 0.742 (0.653) with excitation conditions on resonance with it. Such giant and thickness-independent valley coherence of large single-crystal 3R WS2 at room temperature would provide a firm foundation for quantum manipulation of the valley degree of freedom and practical application of valleytronics.
Original language | English |
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Article number | 6494565 |
Journal | Research |
Volume | 2019 |
DOIs | |
Publication status | Published - 1 Jan 2019 |
MoE publication type | A1 Journal article-refereed |
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Photonics Research and Innovation
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding
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PREIN: Photonics Research and Innovation
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding
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A-Photonics
Sun, Z., Hedberg, D., Dai, Y., Du, M., Kim, M., Pyymaki Perros, A., Lau Kuen Yao, L. & Rajamanickam, R.
01/01/2019 → 31/12/2020
Project: Business Finland: New business from research ideas (TUTLI)