Dimensional cross-over of the charge density wave order parameter in thin exfoliated 1T-VSe${}_2$

Abstract

The capability to isolate one to few unit-cell thin layers from the bulk matrix of layered compounds opens fascinating prospects to engineer novel electronic phases. However, a comprehensive study of the thickness dependence and of potential extrinsic effects are paramount to harness the electronic properties of such atomic foils. One striking example is the charge density wave (CDW) transition temperature in layered dichalcogenides whose thickness dependence remains unclear in the ultrathin limit. Here we present a detailed study of the thickness and temperature dependences of the CDW in VSe${}_2$ by scanning tunnelling microscopy (STM). We show that mapping the real-space CDW periodicity over a broad thickness range unique to STM provides essential insight. We introduce a robust derivation of the local order parameter and transition temperature based on the real space charge modulation amplitude. Both quantities exhibit a striking non-monotonic thickness dependence that we explain in terms of a 3D to 2D dimensional crossover in the FS topology. This finding highlights thickness as a true tuning parameter of the electronic ground state and reconciles seemingly contradicting thickness dependencies determined in independent transport studies.

References in corpus (4)

• Two Dimensional Atomic Crystals
• Insulating state in tetralayers reveals an even-odd interaction effect in multilayer graphene
• Strain Engineering a $4a\times \sqrt{3}a$ Charge Density Wave Phase in Transition Metal Dichalcogenide 1T-VSe${}_2$
• Rise and fall of shape resonances in thin films of BCS superconductors

Cited by in corpus (26)

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• Enhanced superconductivity in few-layer TaS${}_2$ due to healing by oxygenation
• Correlating Structural, Electronic, and Magnetic Properties of Epitaxial VSe2 Thin Films
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• Dimensional crossover and symmetry transformation of the charge density waves in VSe2
• Controllable phase transitions between multiple charge density waves in monolayer 1T-VSe${}_2$ via doping and strain engineering
• Hot carrier-assisted switching of the electron-phonon interaction in 1$T$-VSe${}_2$
• A Unified Picture of Lattice Instabilities in Metallic Transition Metal Dichalcogenides
• Charge order from structured coupling in VSe${}_2$
• Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
• Charge-Order on the Triangular Lattice: A Mean-Field Study for the Lattice $S=1/2$ Fermionic Gas
• Atomically sharp 1D interfaces in 2D lateral heterostructures of VSe${}_2$-NbSe${}_2$ monolayers
• Dimensional crossover of charge order in IrTe${}_2$ with strong interlayer coupling
• Charge density wave modulated third-order nonlinear Hall effect in 1$T$-VSe${}_2$ nanosheets
• Coherent Growth and Characterization of van der Waals 1T-VSe${}_2$ Layers on GaAs(111)B Using Molecular Beam Epitaxy
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