Unique gap structure and symmetry of the charge density wave in single-layer VSe${}_2$

Abstract

Single layers of transition metal dichalcogenides (TMDCs) are excellent candidates for electronic applications beyond the graphene platform; many of them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single layers are generally a planar projection of the corresponding bulk CDWs because of the quasi-two-dimensional nature of TMDCs; a different CDW symmetry is unexpected. We report herein the successful creation of pristine single-layer VSe${}_2$, which shows a ($\sqrt{7}\times \sqrt{3}$) CDW in contrast to the (4 $\times$ 4) CDW for the layers in bulk VSe${}_2$. Angle-resolved photoemission spectroscopy (ARPES) from the single layer shows a sizable ($\sqrt{7}\times \sqrt{3}$) CDW gap of $\sim$100 meV at the zone boundary, a 220 K CDW transition temperature twice the bulk value, and no ferromagnetic exchange splitting as predicted by theory. This robust CDW with an exotic broken symmetry as the ground state is explained via a first-principles analysis. The results illustrate a unique CDW phenomenon in the two-dimensional limit.

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• Strain Engineering a $4a\times \sqrt{3}a$ Charge Density Wave Phase in Transition Metal Dichalcogenide 1T-VSe${}_2$
• Absence of ferromagnetism in VSe2 caused by its charge density wave phase

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• Proximity-induced ferromagnetism and chemical reactivity in few layers VSe2 heterostructures
• Realization of multiple charge density waves in NbTe2 at the monolayer limit
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• Controllable phase transitions between multiple charge density waves in monolayer 1T-VSe${}_2$ via doping and strain engineering
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• Incommensurate $2k_F$ density wave quantum criticality in two dimensional metals
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• Spectroscopic evidence of high temperature superconductivity in VSe2
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• Quantum Monte Carlo and density functional theory study of strain and magnetism in 2D 1T-VSe${}_2$ with charge density wave states
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• Coherent Growth and Characterization of van der Waals 1T-VSe${}_2$ Layers on GaAs(111)B Using Molecular Beam Epitaxy
• Multi band Fermi surface in 1T-VSe2 and its implication for charge density wave phase
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• Generating Two-dimensional Ferromagnetic Charge Density Waves via External Fields
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