Formation of a Two-Dimensional Electronic System in Laterally Assembled WTe Nanowires

Shimizu, Hiroshi; Pu, Jiang; Liu, Zheng; Lim, Hong En; Maruyama, Mina; Nakanishi, Yusuke; Ito, Shunichiro; Kikuchi, Iori; Endo, Takahiko; Yanagi, Kazuhiro; Oshima, Yoshiteru; Okada, Susumu; Takenobu, Taishi; Miyata, Yasumitsu

doi:10.1021/acsanm.2c00377

Cited by 4 publications

(11 citation statements)

References 38 publications

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“…We note that at temperatures below 10–80 K, the resistance of metallic samples increases with decreasing temperature. The overall temperature dependence is similar (but relatively weak) to the results for isolated pristine W 6 Te 6 bundles . In previous work, we explained the phenomena by diffusive transport with a weak antilocalization effect due to a relatively large spin–orbit interaction of heavy W elements .…”

Section: Resultssupporting

confidence: 82%

“…The overall temperature dependence is similar (but relatively weak) to the results for isolated pristine W 6 Te 6 bundles. 31 In previous work, we explained the phenomena by diffusive transport with a weak antilocalization effect due to a relatively large spin−orbit interaction of heavy W elements. 31 The coherent diffusive motion of electrons contributes to the increase in resistance with decreasing temperature.…”

Section: Resultsmentioning

confidence: 97%

“…Binary W 6 Te 6 bundles were synthesized by two-zone CVD, as reported previously. − Briefly, powdered tungsten oxides (WO 3 ) (200 mg, ≥ 99% purity, Sigma-Aldrich) and an excess amount of granular Te (250 mg, 99.99% purity, Sigma-Aldrich) were employed as the precursors for W 6 Te 6 . A SiO 2 /Si substrate (1.5 cm × 1.5 cm) was placed with the WO 3 powder at the center of the downstream furnace.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, Slade and Nakanishi , et al isolated M 6 X 6 nanowires in hollow cores of carbon nanotubes via a vapor-phase reaction. More recently, Yoo and Lim − et al developed chemical vapor deposition (CVD) techniques for the wafer-scale growth of Mo 6 Te 6 and W 6 Te 6 bundles with diameters ranging from a few to several hundred nanometers. Depending upon the substrates, CVD techniques enable the formation of 2D arrays or 3D bundles.…”

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confidence: 99%

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Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

et al. 2023

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One-dimensional (1D) conducting materials are of great interest as potential building blocks for integrated nanocircuits. Ternary 1D transition-metal chalcogenides, consisting of M6X6 wires with intercalated A atoms (M = Mo or W; X = S, Se, or Te; A = alkali or rare metals, etc.), have attracted much attention due to their 1D metallic behavior, superconductivity, and mechanical flexibility. However, the conventional solid-state reaction usually produces micrometer-scale bulk crystals, limiting their potential use as nanoscale conductors. Here we demonstrate a versatile method to fabricate indium (In)-intercalated W6Te6 (In–W6Te6) bundles with a nanoscale thickness. We first prepared micrometer-long, crystalline bundles of van der Waals W6Te6 wires using chemical vapor deposition and intercalated In into the crystal via a vapor-phase reaction. Atomic-resolution electron microscopy revealed that In atoms were surrounded by three adjacent W6Te6 wires. First-principles calculations suggested that their wire-by-wire stacking can transform through postgrowth intercalation. Individual In–W6Te6 bundles exhibited metallic behavior, as theoretically predicted. We further identified the vibrational modes by combining polarized Raman spectroscopy and nonresonant Raman calculations.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

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Section: Introductionmentioning

confidence: 99%

Layer-Structured Anisotropic Metal Chalcogenides: Recent Advances in Synthesis, Modulation, and Applications

2023

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The unique electronic and catalytic properties emerging from low symmetry anisotropic (1D and 2D) metal chalcogenides (MCs) have generated tremendous interest for use in next generation electronics, optoelectronics, electrochemical energy storage devices, and chemical sensing devices. Despite many proof-of-concept demonstrations so far, the full potential of anisotropic chalcogenides has yet to be investigated. This article provides a comprehensive overview of the recent progress made in the synthesis, mechanistic understanding, property modulation strategies, and applications of the anisotropic chalcogenides. It begins with an introduction to the basic crystal structures, and then the unique physical and chemical properties of 1D and 2D MCs. Controlled synthetic routes for anisotropic MC crystals are summarized with example advances in the solution-phase synthesis, vapor-phase synthesis, and exfoliation. Several important approaches to modulate dimensions, phases, compositions, defects, and heterostructures of anisotropic MCs are discussed. Recent significant advances in applications are highlighted for electronics, optoelectronic devices, catalysts, batteries, supercapacitors, sensing platforms, and thermoelectric devices. The article ends with prospects for future opportunities and challenges to be addressed in the academic research and practical engineering of anisotropic MCs.

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Observations of Charge-Density-Wave States in W₆Te₆ Wires

Deng,

Huo,

Bai

et al. 2023

Nano Lett.

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Determining the electronic ground state of a one-dimensional system is crucial to understanding the underlying physics of electronic behavior. Here, we demonstrate the discovery of charge-density wave states in few-wire W 6 Te 6 arrays using scanning tunneling microscopy/spectroscopy. We directly visualize incommensurate charge orders, energy gaps with prominent coherence peaks, and the picometer-scale lattice distortion in nearly disorder-free doublewire systems, thereby demonstrating the existence of Peierls-type charge density waves. In the presence of disorder-induced charge order fluctuations, the coherence peaks resulting from phase correlation disappear and gradually transform the system into the pseudogap states. The power-law zero-bias anomaly and quasi-particle interference analysis further suggest the Tomonaga−Luttinger liquid behavior in such pseudogap region. In addition, we explicitly determined the evolution of the CDW energy gap as a function of stacking-wire numbers. The present study demonstrates the existence of electron−phonon interactions in few-wire W 6 Te 6 that can be tuned by disorders and van der Waals stacking.

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Formation of a Two-Dimensional Electronic System in Laterally Assembled WTe Nanowires

Cited by 4 publications

References 38 publications

Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

Layer-Structured Anisotropic Metal Chalcogenides: Recent Advances in Synthesis, Modulation, and Applications

Observations of Charge-Density-Wave States in W₆Te₆ Wires

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Formation of a Two-Dimensional Electronic System in Laterally Assembled WTe Nanowires

Cited by 4 publications

References 38 publications

Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W6Te6 Wires

Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W6Te6 Wires

Layer-Structured Anisotropic Metal Chalcogenides: Recent Advances in Synthesis, Modulation, and Applications

Observations of Charge-Density-Wave States in W6Te6 Wires

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Product

Resources

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Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W₆Te₆ Wires

Observations of Charge-Density-Wave States in W₆Te₆ Wires