Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS<sub>2</sub> crystals

Lee, Si-Hong; Park, Yun Chang; Chae, Jinwoong; Kim, Gunn; Kim, Hyuk Jin; Choi, Byoung Ki; Lee, In Hak; Chang, Young Jun; Chun, Seung‐Hyun; Jung, Minkyung; Seo, Jungpil; Lee, Sunghun

doi:10.1039/d2tc04186c

Cited by 6 publications

(1 citation statement)

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“…We note finally that in a similar fashion, V 5 Se 8 was previously procured from seed layers of VSe 2 during thin film growth or by increasing the substrate temperature during growth or annealing of single-layer VSe 2 . , In a similar vein, the chemical vapor deposition growth of VS 2 nanosheets generally leads to the simultaneous presence of VS 2 and V 5 S 8 . , In each case, the small differences in formation energy between the self-intercalated material and the TMDC are emphasized. Here, we showed that providing extra V atoms after an initial growth step can help to favor one phase over the other and enables one to grow phase-pure ultrathin V 5 S 8 -derived materials down to the minimal thickness of 1.15 nm.…”

Section: Resultsmentioning

confidence: 99%

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

van Efferen,

Hall,

Atodiresei

et al. 2024

ACS Nano

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Two ultimately thin vanadium-rich 2D materials based on VS2 are created via molecular beam epitaxy and investigated using scanning tunneling microscopy, X-ray photoemission spectroscopy, and density functional theory (DFT) calculations. The controlled synthesis of stoichiometric single-layer VS2 or either of the two vanadium-rich materials is achieved by varying the sample coverage and sulfur pressure during annealing. Through annealing of small stoichiometric single-layer VS2 islands without S pressure, S-vacancies spontaneously order in 1D arrays, giving rise to patterned adsorption. Via the comparison of DFT calculations with scanning tunneling microscopy data, the atomic structure of the S-depleted phase, with a stoichiometry of V4S7, is determined. By depositing larger amounts of vanadium and sulfur, which are subsequently annealed in a S-rich atmosphere, self-intercalated ultimately thin V5S8-derived layers are obtained, which host 2 × 2 V-layers between sheets of VS2. We provide atomic models for the thinnest V5S8-derived structures. Finally, we use scanning tunneling spectroscopy to investigate the charge density wave observed in the 2D V5S8-derived islands.

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Section: Resultsmentioning

confidence: 99%

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

van Efferen,

Hall,

Atodiresei

et al. 2024

ACS Nano

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Prediction methods for phonon transport properties of inorganic crystals: from traditional approaches to artificial intelligence

Wei,

Liu,

Qin

2025

Nanoscale Horiz.

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Charge density wave transition and unusual resistance hysteresis in vanadium disulfide (1T-VS₂) microflakes

Pal,

Majhi,

et al. 2024

Phys. Scr.

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We report existence of charge density wave (CDW) transition with unusual resistivity hysteresis in stable micro-flakes of 2D transition metal di-chalcogenide (TMDC) vanadium disulfide (1T-VS2) as ascertained by structural studies, Raman spectroscopy, heat capacity, resistivity measurements and supported by phonon calculations based on density functional theory. The CDW transition occurs at around 296 K on cooling and manifests itself by the onset of resistivity with a negative temperature coefficient, which we identify as the transition temperature (TCDW). The transition is identified by a distinct peak in the heat capacity at T ≈ TCDW along with anomalies in temperature variation of the lattice parameters and complimentary signatures in electron diffraction and temperature-dependent Raman spectroscopy. The temperature-dependent resistivity measurements done with different ramp rates of cooling and heating show strong hysteresis and a low temperature relaxation pointing to the existence of metastable states below the transition. The Raman spectroscopy data show a hysteresis loop below the onset of the CDW transition. The phonon band structure calculations carried out on the 1T-VS2 system show the existence of the phonon mode softening along the diagonal of the Brillouin zone, which is pronounced near the transition temperature implying the prominent role of the mode softening as a driver of the transition. The results imply that the formation of CDW is sensitive to phonon mode softening rather than energy gap opening at the Fermi level.

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Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS₂ crystals

Abstract: A charge density wave (CDW) transition is one of the fundamental quantum phenomena used to unveil the interactions between electrons and phonons that are coexisting or competing with other intriguing...

Cited by 6 publications

References 64 publications

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

Prediction methods for phonon transport properties of inorganic crystals: from traditional approaches to artificial intelligence

Charge density wave transition and unusual resistance hysteresis in vanadium disulfide (1T-VS₂) microflakes

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Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS2 crystals

Abstract: A charge density wave (CDW) transition is one of the fundamental quantum phenomena used to unveil the interactions between electrons and phonons that are coexisting or competing with other intriguing...

Cited by 6 publications

References 64 publications

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

2D Vanadium Sulfides: Synthesis, Atomic Structure Engineering, and Charge Density Waves

Prediction methods for phonon transport properties of inorganic crystals: from traditional approaches to artificial intelligence

Charge density wave transition and unusual resistance hysteresis in vanadium disulfide (1T-VS2) microflakes

Contact Info

Product

Resources

About

Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS₂ crystals

Charge density wave transition and unusual resistance hysteresis in vanadium disulfide (1T-VS₂) microflakes