Two Phonon Interactions and Charge Density Wave in Single Crystalline VSe2 Probed by Raman Spectroscopy

Abstract

Charge density wave (CDW) is a unique phenomenon mostly realized in two-dimensional (2D) metallic layered transition metal dichalcogenides (TMDCs). Here, we report on Raman spectroscopy of single crystal 1T-VSe2 and observed signature of commensurate CDW (C-CDW) and incommensurate (I-CDW) transition, in the temperature range of 50-120 K. The room temperature Raman spectra showed a sharp A1g mode ~ 206 cm-1 along with two new weak and broad Raman modes associated to Eg mode ~ 257 cm-1 and two-phonon mode (2ph) ~ 332 cm-1. The onset of I-CDW and C-CDW is estimated from resistance measurements supported by magnetic measurements. Remarkably, at the onset of I-CDW ~ 115 K, a significant enhancement in the intensity of weak Eg mode is observed along with emergence of a doubly degenerate Eg(2) mode ~ 144 cm-1. Below 70 K, a weak A1g mode ~ 170 cm-1 emerged signifying the onset of C-CDW. Anomalous phonon softening of Eg mode ~ 257 cm-1 and 2ph process mode below I-CDW has been also observed, which is signifying the involvement of electron-phonon coupling.

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Cited by in corpus (11)

• Phonon collapse and van der Waals melting of the 3D charge density wave of VSe${}_2$
• Ultrafast triggering of insulator-metal transition in two-dimensional VSe${}_2$
• Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance
• Anisotropic Light-Matter Interactions in Single Crystal Topological Insulator Bismuth Selenide
• Charge density wave modulated third-order nonlinear Hall effect in 1$T$-VSe${}_2$ nanosheets
• Quantum Monte Carlo and density functional theory study of strain and magnetism in 2D 1T-VSe${}_2$ with charge density wave states
• Observation of Weak Kondo Effect and Angle Dependent Magnetoresistance in Layered Antiferromagnetic V${}_5$S${}_8$ Single Crystal
• Identification of a Low Energy Metastable 1$T$-Type Phase for Monolayer VSe2
• Comparative study of Kondo effect in Vanadium dichalcogenides VX${}_2$ (X=Se & Te)
• Anomalous amplitude mode dynamics below the expected charge-density-wave transition in 1$T$-VSe${}_2$
• Electron-phonon interaction, magnetic phase transition, charge density waves and resistive switching in VS2 and VSe2 revealed by Yanson point contact spectroscopy