期刊
ACS NANO
卷 12, 期 9, 页码 9405-9411出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b04540
关键词
Dirac semimetal; platinum telluride; van der Waals epitaxy; electrical conductivity; plasmons
类别
资金
- National Natural Science Foundation of China [21633012, 61390500, 51233006, 60911130231]
- Beijing Municipal Science and Technology Commission [Z161100002116025]
- Chinese Academy of Sciences [XDB12030100]
- [2016YFA0200101]
Platinum telluride (PtTe2), a member of metallic noble-transition-metal dichalcogenides (MNTMDs), has emerged as an indispensable candidate for superconducting, magnetic, and other electronic phase engineering, as well as optic applications. Herein, we report the van der Waals epitaxy of high-crystalline few-layer PtTe2 crystals on inert mica. Density functional theory calculations are used to illustrate a type-II Dirac cone along the Gamma-A direction in the PtTe2 crystal. Impressively, the PtTe2 devices exhibit an extra-high electrical conductivity of 10(7) S m(-1), 1000 times higher than that of metallic 1T MoS2. Meanwhile, the magnetoresistance effect at low temperatures reaches 800% in a field of 9.0 T. Furthermore, near-field nanooptical properties are assessed on PtTe2. Considering the subwavelength effect, the plasmonic wavelength lambda(p) approximate to 200 nm of 1T PtTe2 is obtained and the carrier concentration calculated from lambda(p) is about 1.22 X 10(15) cm(-2), which is 100-fold higher than that of MoTe(2 )in the previous reports. Therefore, our work demonstrates the growth of MNTMDs and provides insights into the plasmonic properties of 2D metallic telluride compounds.
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