Projekteja vuodessa
Abstrakti
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.
Alkuperäiskieli | Englanti |
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Artikkeli | 6494565 |
Julkaisu | Research |
Vuosikerta | 2019 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 1 tammik. 2019 |
OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |
Sormenjälki
Sukella tutkimusaiheisiin 'Giant valley coherence at room temperature in 3R WS2 with broken inversion symmetry'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 11 Päättynyt
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A-Photonics
Sun, Z., Pyymaki Perros, A., Dai, Y., Du, M., Kim, M., Hedberg, D., Lau Kuen Yao, L. & Rajamanickam, R.
01/01/2019 → 31/12/2020
Projekti: Business Finland: New business from research ideas (TUTLI)
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PREIN: Fotoniikan Tutkimus ja Innovaatio
01/01/2019 → 31/12/2022
Projekti: Academy of Finland: Other research funding
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Fotoniikan Tutkimus ja Innovaatio
01/01/2019 → 31/12/2022
Projekti: Academy of Finland: Other research funding