Infrared Nanoimaging of Surface Plasmons in Type-II Dirac Semimetal PtTe2 Nanoribbons

Xin Hu; Kin Ping Wong; Longhui Zeng; Xuyun Guo; Tong Liu; Lei Zhang; Qin Chen; Xuefeng Zhang; Ye Zhu; Kin Hung Fung; Shu Ping Lau

doi:10.1021/acsnano.0c02466

Infrared Nanoimaging of Surface Plasmons in Type-II Dirac Semimetal PtTe₂ Nanoribbons

Xin Hu, Kin Ping Wong, Longhui Zeng, Xuyun Guo, Tong Liu, Lei Zhang, Qin Chen, Xuefeng Zhang, Ye Zhu, Kin Hung Fung, Shu Ping Lau

Research output: Journal article publication › Journal article › Academic research › peer-review

25 Citations (Scopus)

Abstract

Topological Dirac semimetals made of two-dimensional transition-metal dichalcogenides (TMDCs) have attracted enormous interest for use in electronic and optoelectronic devices because of their electron transport properties. As van der Waals materials with a strong interlayer interaction, these semimetals are expected to support layer-dependent plasmonic polaritons yet to be revealed experimentally. Here, we demonstrate the apparent retardation and attenuation of mid-infrared (MIR) plasmonic waves in type-II Dirac semimetal platinum tellurium (PtTe ₂) nanoribbons and nanoflakes by near-field nanoimaging. The attenuated dispersion relations for the plasmonic modes in the PtTe ₂ nanoribbons (15-25 nm thick) extracted from the near-field standing-wave patterns are applied for the fitting of PtTe ₂ permittivity in the MIR regime, indicating that both free carriers and Dirac fermions are involved in MIR light-matter interaction in PtTe ₂. The annihilation of plasmonic modes in the ultrathin (<10 nm) PtTe ₂ is observed and analyzed, which manifests no near-field resonant pattern due to the intrinsic layer-dependent optoelectronic properties of PtTe ₂. These results could pave a potential wave for MIR photodetection and modulation with TMDC semimetals.

Original language	English
Pages (from-to)	6276-6284
Number of pages	9
Journal	ACS Nano
Volume	14
Issue number	5
DOIs	https://doi.org/10.1021/acsnano.0c02466
Publication status	Published - 26 May 2020

Keywords

Dirac semimetals
platinum tellurium nanoribbons
s-SNOM
surface plasmons
transition-metal dichalcogenides

ASJC Scopus subject areas

General Materials Science
General Engineering
General Physics and Astronomy

More information

10.1021/acsnano.0c02466

Cite this

@article{cf5ece8edb92404798fde092bb9d65ff,

title = "Infrared Nanoimaging of Surface Plasmons in Type-II Dirac Semimetal PtTe2 Nanoribbons",

abstract = "Topological Dirac semimetals made of two-dimensional transition-metal dichalcogenides (TMDCs) have attracted enormous interest for use in electronic and optoelectronic devices because of their electron transport properties. As van der Waals materials with a strong interlayer interaction, these semimetals are expected to support layer-dependent plasmonic polaritons yet to be revealed experimentally. Here, we demonstrate the apparent retardation and attenuation of mid-infrared (MIR) plasmonic waves in type-II Dirac semimetal platinum tellurium (PtTe 2) nanoribbons and nanoflakes by near-field nanoimaging. The attenuated dispersion relations for the plasmonic modes in the PtTe 2 nanoribbons (15-25 nm thick) extracted from the near-field standing-wave patterns are applied for the fitting of PtTe 2 permittivity in the MIR regime, indicating that both free carriers and Dirac fermions are involved in MIR light-matter interaction in PtTe 2. The annihilation of plasmonic modes in the ultrathin (<10 nm) PtTe 2 is observed and analyzed, which manifests no near-field resonant pattern due to the intrinsic layer-dependent optoelectronic properties of PtTe 2. These results could pave a potential wave for MIR photodetection and modulation with TMDC semimetals. ",

keywords = "Dirac semimetals, platinum tellurium nanoribbons, s-SNOM, surface plasmons, transition-metal dichalcogenides",

author = "Xin Hu and Wong, {Kin Ping} and Longhui Zeng and Xuyun Guo and Tong Liu and Lei Zhang and Qin Chen and Xuefeng Zhang and Ye Zhu and Fung, {Kin Hung} and Lau, {Shu Ping}",

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T1 - Infrared Nanoimaging of Surface Plasmons in Type-II Dirac Semimetal PtTe2 Nanoribbons

AU - Hu, Xin

AU - Wong, Kin Ping

AU - Zeng, Longhui

AU - Guo, Xuyun

AU - Liu, Tong

AU - Zhang, Lei

AU - Chen, Qin

AU - Zhang, Xuefeng

AU - Zhu, Ye

AU - Fung, Kin Hung

AU - Lau, Shu Ping

PY - 2020/5/26

Y1 - 2020/5/26

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AB - Topological Dirac semimetals made of two-dimensional transition-metal dichalcogenides (TMDCs) have attracted enormous interest for use in electronic and optoelectronic devices because of their electron transport properties. As van der Waals materials with a strong interlayer interaction, these semimetals are expected to support layer-dependent plasmonic polaritons yet to be revealed experimentally. Here, we demonstrate the apparent retardation and attenuation of mid-infrared (MIR) plasmonic waves in type-II Dirac semimetal platinum tellurium (PtTe 2) nanoribbons and nanoflakes by near-field nanoimaging. The attenuated dispersion relations for the plasmonic modes in the PtTe 2 nanoribbons (15-25 nm thick) extracted from the near-field standing-wave patterns are applied for the fitting of PtTe 2 permittivity in the MIR regime, indicating that both free carriers and Dirac fermions are involved in MIR light-matter interaction in PtTe 2. The annihilation of plasmonic modes in the ultrathin (<10 nm) PtTe 2 is observed and analyzed, which manifests no near-field resonant pattern due to the intrinsic layer-dependent optoelectronic properties of PtTe 2. These results could pave a potential wave for MIR photodetection and modulation with TMDC semimetals.

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