journal article·2020-05Open access

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

Chi Sin Tang, Xinmao Yin, Ming Yang, Di Wu, Jing Wu, Lai Mun Wong, Changjian Li, Shi Wun Tong, Yung‐Huang Chang, Fangping Ouyang, Yuan Ping Feng, Shi Jie Wang, Dongzhi Chi, Mark B. H. Breese, Wenjing Zhang, Andrivo Rusydi, Andrew T. S. Wee

Advanced Science· Volume 7· Issue 10

Abstract

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics Faculty of Science National University of Singapore S12 Science Drive 3 Singapore 117551 Singapore

NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 21 Lower Kent Ridge Singapore 119077 Singapore

Singapore Synchrotron Light Source (SSLS) National University of Singapore 5 Research Link Singapore 117603 Singapore

Institute of Materials Research and Engineering (IMRE) A*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis Singapore 138634 Singapore

International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China

School of Physics and Electronics Central South University No. 932, South Lushan Road Changsha Hunan 410083 China

Department of Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore

Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology 123 University Road, Section 3 Douliou Yunlin 64002 Taiwan

Funding

National Natural Science Foundation of China · Science and Technology Planning Project of Guangdong Province · China Postdoctoral Science Foundation · National Research Foundation Singapore

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