Unknown

Dataset Information

0

Giant Valley Coherence at Room Temperature in 3R WS2 with Broken Inversion Symmetry.


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.

SUBMITTER: Du L 

PROVIDER: S-EPMC6946257 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

altmetric image

Publications

Giant Valley Coherence at Room Temperature in 3R WS<sub>2</sub> with Broken Inversion Symmetry.

Du Luojun L   Tang Jian J   Liang Jing J   Liao Mengzhou M   Jia Zhiyan Z   Zhang Qinghua Q   Zhao Yanchong Y   Yang Rong R   Shi Dongxia D   Gu Lin L   Xiang Jianyong J   Liu Kaihui K   Sun Zhipei Z   Zhang Guangyu G  

Research (Washington, D.C.) 20191013


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 WS<sub>2</sub> large single-crystal with thicknesses ranging from monolayer to octalayer at room temperature.  ...[more]

Similar Datasets

| S-EPMC4566088 | biostudies-literature
| S-EPMC6447535 | biostudies-literature
| S-EPMC4136578 | biostudies-literature
| S-EPMC5027543 | biostudies-literature
| S-EPMC4700440 | biostudies-literature
| S-EPMC5989275 | biostudies-literature
| S-EPMC7442784 | biostudies-literature
| S-EPMC5577210 | biostudies-literature
| S-EPMC4510697 | biostudies-other
| S-EPMC6603724 | biostudies-literature