Suppression of charge density wave phases in ultrathin 1T-TaS2

Abstract

Using temperature dependent Raman spectroscopy we address the question of how the transition from bulk to few atomic layers affects the charge density wave (CDW) phases in 1T-TaS2. We find that for crystals with thickness larger than approx 10nm the transition temperatures between the different phases as well as the hysteresis that occurs in the thermal cycle correspond to the ones expected for a bulk sample. However, when the crystals become thinner than $\approx 10nm$, the commensurate CDW phase is suppressed down to the experimentally accessible temperatures. In addition, the nearly commensurate CDW phase is diminished below approx 4nm. These findings suggest that the interlayer coupling plays a significant role in determining the properties of CDW systems consisting of a few unit cells in the vertical direction.

References in corpus (9)

• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Is 1T-TaS${}_2$ a 40 year old quantum spin liquid?
• A metallic mosaic phase and the origin of Mott insulating state in 1T-TaS2
• Structure and Control of Charge Density Waves in Two-Dimensional 1T-TaS2
• Nanoscale manipulation of the Mott insulating state coupled to charge order in 1T-TaS2
• Atomic Lattice Disorder in Charge Density Wave Phases of Exfoliated Dichalcogenides (1T-TaS2)
• Zone-center phonons of bulk, few-layer, and monolayer 1T-TaS${}_2$: Detection of the commensurate charge density wave phase through Raman scattering
• Distinct surface and bulk charge density waves in ultrathin 1T-TaS2

Cited by in corpus (6)

• Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides
• Two-dimensional charge density wave TaX${}_2$ (X=S, Se, Te) from first principles
• Probing charge density wave phases and the Mott transition in $1T$-TaS${}_2$ by inelastic light scattering
• Emergent quantum phenomena in two-dimensional 1T-TaS2
• Strongly Enhanced Charge-Density Waves and Correlated Insulating State in Atomically Thin 1$T$-TaS${}_2$
• Raman scattering fingerprints of the charge density wave state in one-dimensional NbTe${}_4$