Terahertz response of monolayer and few-layer WTe2 at the nanoscale

Jing, Ran; Shao, Yinming; Fei, Zaiyao; Lo, Chiu Fan Bowen; Vitalone, Rocco A.; Ruta, Francesco L.; Staunton, John; Zheng, William J. -C; Mcleod, Alexander S.; Sun, Zhiyuan; Jiang, Bor-yuan; Chen, Xinzhong; Fogler, Michael M.; Millis, Andrew J.; Liu, Mengkun; Cobden, David H.; Xu, Xiaodong; Basov, D. N.

doi:10.1038/s41467-021-23933-z

Title: Terahertz response of monolayer and few-layer WTe2 at the nanoscale

Journal Article · 22 September 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-23933-z · OSTI ID:1821496

;

; Lo, Chiu Fan Bowen; Vitalone, Rocco A.;

; Staunton, John; Zheng, William J. -C;

;

; Jiang, Bor-yuan;

; Fogler, Michael M.; Millis, Andrew J.;

;

; Xu, Xiaodong;

Abstract Tungsten ditelluride (WTe ₂ ) is an atomically layered transition metal dichalcogenide whose physical properties change systematically from monolayer to bilayer and few-layer versions. In this report, we use apertureless scattering-type near-field optical microscopy operating at Terahertz (THz) frequencies and cryogenic temperatures to study the distinct THz range electromagnetic responses of mono-, bi- and trilayer WTe ₂ in the same multi-terraced micro-crystal. THz nano-images of monolayer terraces uncovered weakly insulating behavior that is consistent with transport measurements. The near-field signal on bilayer regions shows moderate metallicity with negligible temperature dependence. Subdiffractional THz imaging data together with theoretical calculations involving thermally activated carriers favor the semimetal scenario with $$$$\Delta \approx -10\,{{{\rm{meV}}}}$$$$ $Δ \approx - 10 meV$ over the semiconductor scenario for bilayer WTe ₂ . Also, we observed clear metallic behavior of the near-field signal on trilayer regions. Our data are consistent with the existence of surface plasmon polaritons in the THz range confined to trilayer terraces in our specimens. Finally, data for microcrystals up to 12 layers thick reveal how the response of a few-layer WTe ₂ asymptotically approaches the bulk limit.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0019443

OSTI ID:: 1821496

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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