Please use this identifier to cite or link to this item: https://doi.org/10.1021/acsnano.0c00303
Title: Room Temperature Commensurate Charge Density Wave on Epitaxially Grown Bilayer 2H-Tantalum Sulfide on Hexagonal Boron Nitride
Authors: Fu, Wei 
Qiao, Jingsi 
Zhao, Xiaoxu 
Chen, Yu 
Fu, Deyi 
Yu, Wei
Leng, Kai
Song, Peng 
Chen, Zhi 
Yu, Ting
Pennycook, Stephen J 
Quek, Su Ying 
Loh, Kian Ping 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
charge density wave
two-dimensional transition metal dichalcogenides
molecular beam epitaxy
interfacial electrostatic interaction
Moire superlattice
TRANSITION-METAL
DYNAMICS
DICHALCOGENIDES
MONOLAYER
FLAKES
ORDER
Issue Date: 28-Apr-2020
Publisher: AMER CHEMICAL SOC
Citation: Fu, Wei, Qiao, Jingsi, Zhao, Xiaoxu, Chen, Yu, Fu, Deyi, Yu, Wei, Leng, Kai, Song, Peng, Chen, Zhi, Yu, Ting, Pennycook, Stephen J, Quek, Su Ying, Loh, Kian Ping (2020-04-28). Room Temperature Commensurate Charge Density Wave on Epitaxially Grown Bilayer 2H-Tantalum Sulfide on Hexagonal Boron Nitride. ACS NANO 14 (4) : 3917-3926. ScholarBank@NUS Repository. https://doi.org/10.1021/acsnano.0c00303
Abstract: © 2020 American Chemical Society. The breaking of multiple symmetries by periodic lattice distortion at a commensurate charge density wave (CDW) state is expected to give rise to intriguing interesting properties. However, accessing the commensurate CDW state on bulk TaS2 crystals typically requires cryogenic temperatures (77 K), which precludes practical applications. Here, we found that heteroepitaxial growth of a 2H-tantalum disulfide bilayer on a hexagonal-boron nitride (h-BN) substrate produces a robust commensurate CDW order at room temperature, characterized by a Moiré superlattice of 3 × 3 TaS2 on a 4 × 4 h-BN unit cell. The CDW order is confirmed by scanning transmission electron microscopy and Raman measurements. Theoretical calculations reveal that the stabilizing energy for the CDW phase of the monolayer and bilayer 2H-TaS2-on-h-BN substrates arises primarily from interfacial electrostatic interactions and, to a lesser extent, interfacial strain. Our work shows that engineering interfacial electrostatic interactions in an ultrathin van der Waals heterostructure constitutes an effective way to enhance CDW order in two-dimensional materials.
Source Title: ACS NANO
URI: https://scholarbank.nus.edu.sg/handle/10635/170891
ISSN: 19360851
1936086X
DOI: 10.1021/acsnano.0c00303
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