Pseudogap, Fermi arc, and Peierls-insulating phase induced by 3D-2D crossover in monolayer VSe2

Abstract

One of important challenges in condensed-matter physics is to realize new quantum states of matter by manipulating the dimensionality of materials, as represented by the discovery of high-temperature superconductivity in atomic-layer pnictides and room-temperature quantum Hall effect in graphene. Transition-metal dichalcogenides (TMDs) provide a fertile platform for exploring novel quantum phenomena accompanied by the dimensionality change, since they exhibit a variety of electronic/magnetic states owing to quantum confinement. Here we report an anomalous metal-insulator transition induced by 3D-2D crossover in monolayer 1T-VSe2 grown on bilayer graphene. We observed a complete insulating state with a finite energy gap on the entire Fermi surface in monolayer 1T-VSe2 at low temperatures, in sharp contrast to metallic nature of bulk. More surprisingly, monolayer 1T-VSe2 exhibits a pseudogap with Fermi arc at temperatures above the charge-density-wave temperature, showing a close resemblance to high-temperature cuprates. This similarity suggests a common underlying physics between two apparently different systems, pointing to the importance of charge/spin fluctuations to create the novel electronic states, such as pseudogap and Fermi arc, in these materials.

arXiv commentNano Res. in press

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• Tailoring Magnetism in Self-intercalated Cr1+δTe2 Epitaxial Films
• Pressure-induced suppression of charge density wave and emergence of Superconductivity in 1T-VSe2
• Monolayer VTe2: Incommensurate Fermi surface nesting and suppression of charge density waves
• Structural phase transitions in VSe2: energetics, electronic structure and magnetism
• Correlating Structural, Electronic, and Magnetic Properties of Epitaxial VSe2 Thin Films
• Novel Superstructure-Phase Two-Dimensional Material 1$\text{T}$-VSe${}_2$ at High Pressure
• First-principles theory of infrared vibrational spectroscopy in metals and semimetals: application to graphite
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• Ultrafast triggering of insulator-metal transition in two-dimensional VSe${}_2$
• Dynamical mean-field study of Vanadium diselenide monolayer ferromagnetism
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• Charge order with unusual star-of-David lattice in monolayer NbTe2
• Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
• Two-Dimensional Higher-Order Topological Metals
• Pressure-induced 1T to 3R structural phase transition in metallic VSe2: X-ray diffraction and first-principles theory
• Charge density wave modulated third-order nonlinear Hall effect in 1$T$-VSe${}_2$ nanosheets
• Alloying 2D VSe2 with Pt: from a charge density wave state to a disordered insulator
• Probing a Bose Metal via Electrons: Inescapable non-Fermi liquid scattering and pseudogap physics
• Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2
• Electronic structure and charge-density wave transition in monolayer VS_{2}