Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition‐Metal Dichalcogenides

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Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition‐Metal Dichalcogenides
Title:
Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition‐Metal Dichalcogenides
Other Titles:
Advanced Science
Publication Date:
16 April 2020
Citation:
Tang C. S., Yin X., Yang M., Wu D., Wu J., Wong L. M., Li C., Tong S. W., Chang Y.‐H., Ouyang F., Feng Y. P., Wang S. J., Chi D., Breese M. B. H., Zhang W., Rusydi A., Wee A. T. S., Anisotropic Collective Charge Excitations in Quasimetallic 2D Transition‐Metal Dichalcogenides. Adv. Sci. 2020, 7, 1902726 10.1002/advs.201902726
Abstract:
The quasimetallic 1T′ phase 2D transition‐metal dichalcogenides (TMDs) consist of 1D zigzag metal chains stacked periodically along a single axis. This gives rise to its prominent physical properties which promises the onset of novel physical phenomena and applications. Here, the in‐plane electronic correlations are explored, and new mid‐infrared plasmon excitations in 1T′ phase monolayer WSe2 and MoS2 are observed using optical spectroscopies. Based on an extensive first‐principles study which analyzes the charge dynamics across multiple axes of the atomic‐layered systems, the collective charge excitations are found to disperse only along the direction perpendicular to the chains. Further analysis reveals that the interchain long‐range coupling is responsible for the coherent 1D charge dynamics and the spin–orbit coupling affects the plasmon frequency. Detailed investigation of these charge collective modes in 2D‐chained systems offers opportunities for novel device applications and has implications for the underlying mechanism that governs superconductivity in 2D TMD systems.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the Ministry of Education - AcRF Tier-2
Grant Reference no. : MOE2016-T2-2-110

This research / project is supported by the National Research Foundation - Competitive Research Funding
Grant Reference no. : NRF-CRP 8-2011-06

This research / project is supported by the National Research Foundation - Competitive Research Funding
Grant Reference no. : NRF-CRP15-2015-01

This research / project is supported by the A*STAR, SERC - 2D PHAROS project
Grant Reference no. : SERC 1527000012

This work is financially supported by the National Natural Science Foundation of China (51472164), the Natural Science Foundation of SZU (000050), the 1000 Talents Program for Young Scientists of China, the Shenzhen Peacock Plan (KQTD2016053112042971), the Educational Commission of Guangdong Province (2015KGJHZ006), the Science and Technology Planning Project of Guangdong Province (2016B050501005), the China Postdoctoral Science Foundation funded project (2016M600664)
Description:
Open access publisher copy is available at https://doi.org/10.1002/advs.201902726
ISSN:
2198-3844
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