Visualizing Exotic Orbital Texture in the Single-Layer Mott Insulator 1T-TaSe2

Abstract

Mott insulating behavior is induced by strong electron correlation and can lead to exotic states of matter such as unconventional superconductivity and quantum spin liquids. Recent advances in van der Waals material synthesis enable the exploration of novel Mott systems in the two-dimensional limit. Here we report characterization of the local electronic properties of single- and few-layer 1T-TaSe2 via spatial- and momentum-resolved spectroscopy involving scanning tunneling microscopy and angle-resolved photoemission. Our combined experimental and theoretical study indicates that electron correlation induces a robust Mott insulator state in single-layer 1T-TaSe2 that is accompanied by novel orbital texture. Inclusion of interlayer coupling weakens the insulating phase in 1T-TaSe2, as seen by strong reduction of its energy gap and quenching of its correlation-driven orbital texture in bilayer and trilayer 1T-TaSe2. Our results establish single-layer 1T-TaSe2 as a useful new platform for investigating strong correlation physics in two dimensions.

References in corpus (26)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Optimized norm-conserving Vanderbilt pseudopotentials
• Correlated Electrons in High Temperature Superconductors
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Optimization Algorithm for the Generation of ONCV Pseudopotentials
• Tightly bound excitons in monolayer WSe2
• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Signatures of Gate-Tunable Superconductivity in Trilayer Graphene/Boron Nitride Moiré Superlattice
• Evidence of Gate-Tunable Mott Insulator in Trilayer Graphene-Boron Nitride Moiré Superlattice
• Giant Phonon-induced Conductance in Scanning Tunneling Spectroscopy of Gate-tunable Graphene
• Screening and Many-Body Effects in Two-Dimensional Crystals: Monolayer MoS${}_2$
• Unfolding spinor wavefunctions and expectation values of general operators: Introducing the unfolding-density operator
• Orbital textures and charge density waves in transition metal dichalcogenides
• Dynamic band structure tuning of graphene moiré superlattices with pressure
• A metallic mosaic phase and the origin of Mott insulating state in 1T-TaS2
• Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
• Coulomb drag
• Nanoscale manipulation of the Mott insulating state coupled to charge order in 1T-TaS2
• Three Dimensional Metallic and Two Dimensional Insulating Behavior in Tantalum Dichalcogenides
• Disrupted orbital order and the pseudo-gap in layered 1T-TaS${}_2$
• Spectroscopic signatures of a bandwidth-controlled Mott transition at the surface of 1T-TaSe${}_2$
• Crystalline and electronic structure of single-layer TaS${}_2$
• Orbital-driven Mottness collapse in 1T-TaS2-xSex transition metal dichalcogenide
• Orbital density wave order and electronic correlation driven insulating 1T-TaS2 monolayer

Cited by in corpus (77)

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• Disentangling orbital and valley Hall effects in bilayers of transition metal dichalcogenides
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• A Microscopic Perspective on Moiré Materials
• Nuclear spin polarization and control in a van der Waals material
• Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2
• Monolayer 1T-NbSe2 as a 2D correlated magnetic insulator
• Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2
• Tunneling spectroscopy of quantum spin liquids
• Two-dimensional orbital Hall insulators
• Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe${}_2$
• Effect of Stacking Order on the Electronic State of 1T-TaS${}_2$
• Charge density wave instability and pressure-induced superconductivity in bulk 1T-NbS2
• Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe${}_2$
• Heterogeneous Ta-dichalcogenide bilayer: heavy fermions or doped Mott physics?
• Mott insulator tuning via structural distortion in monolayer 1T-NbSe2
• Quantum simulator to emulate lower dimensional molecular structure
• Superconductivity in monolayer Ba${}_2$N electride: a first-principles study
• Coherent phonons and the interplay between charge density wave and Mott phases in 1$T$-TaSe${}_2$
• Local gate control of Mott metal-insulator transition in a 2D metal-organic framework
• Two-dimensional charge density wave TaX${}_2$ (X=S, Se, Te) from first principles
• Nonconventional screening of Coulomb interaction in two-dimensional semiconductors and metals: A comprehensive cRPA study of MX2 (M=Mo, W, Nb, Ta; X=S, Se, Te)
• Mott phase in a van der Waals transition-metal halide at single layer limit
• Large-gap insulating dimer ground state in monolayer IrTe2
• Magnetic Impurity as a Local Probe of the U(1) Quantum Spin Liquid with Spinon Fermi Surface
• Exploring the Charge Density Wave phase of 1$T$-TaSe${}_2$: Mott or Charge-transfer Gap?
• $\text{Ab initio}$ theory of magnetism in two-dimensional $1T$-TaS${}_2$
• Ultrafast triggering of insulator-metal transition in two-dimensional VSe${}_2$
• A novel $\sqrt{19}\times \sqrt{19}$ superstructure in epitaxially grown 1T-TaTe${}_2$
• Reconcile the Bulk Metallic and Surface Insulating state in 1T-TaSe${}_2$
• Orbital-collaborative Charge Density Wave in Monolayer VTe2
• Fractionalization on the Surface: Is Type-II Terminated $1T$-TaS${}_2$ Surface an Anomalously Realized Spin Liquid?
• Deconfinement of Mott Localized Electrons into Topological and Spin-Orbit Coupled Dirac Fermions
• Metal-insulator transition in monolayer MoS${}_2$ via contactless chemical doping
• Modified interlayer stacking and insulator to correlated-metal transition driven by uniaxial strain in 1$T$-TaS${}_2$
• Competition of Spinon Fermi Surface and Heavy Fermi Liquids states from the Periodic Anderson to the Hubbard model
• Impurity-induced resonant spinon zero modes in Dirac quantum spin-liquids
• Experimental Evidence of Stable 2$H$ Phase on the Surface of Layered 1$T^{\prime }$-TaTe${}_2$
• Coulomb Engineering of two-dimensional Mott materials
• Observation of a multitude of correlated states at the surface of bulk 1T-TaSe${}_2$ crystals
• Charge order with unusual star-of-David lattice in monolayer NbTe2
• Revealing the Charge Density Wave Proximity Effect in Graphene on 1T-TaS${}_2$
• Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
• Electronic Density of States of a $U\left(1\right)$ Quantum Spin Liquid with Spinon Fermi Surface. I. Orbital Magnetic Field Effects
• Ultra-Efficient Resistance Switching between Charge Ordered Phases in 1T-TaS${}_2$ with a Single Picosecond Electrical Pulse
• Spectrally resolving the phase and amplitude of coherent phonons in the charge density wave state of 1$T$-TaSe${}_2$
• Electronic Density of States of a $U\left(1\right)$ Quantum Spin Liquid with Spinon Fermi Surface. II. Zeeman Magnetic Field Effects
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Signature of Orbital Driven Finite Momentum Pairing in a 3D Ising Superconductor
• Artificial heavy fermions in a van der Waals heterostructure
• Doped Mott phase and charge correlations in monolayer 1T-NbSe${}_2$
• Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids
• Identification of soft modes across the commensurate-to-incommensurate charge density wave transition in 1$T$-TaSe${}_2$
• Controlling magnetic frustration in 1T-TaS${}_2$ via Coulomb engineered long-range interactions
• Nature of metallic and insulating domains in the CDW system 1T-TaSe2
• Direct evidence of intrinsic Mott state and its layer-parity oscillation in a breathing kagome crystal down to monolayer
• Orbital textures and evolution of correlated insulating state in monolayer 1T phase transition metal dichalcogenides
• Moiré Modulation of Charge Density Waves
• Self-doped flat band and spin-triplet superconductivity in monolayer 1T-TaSe${}_{2-x}$Te${}_x$
• Moiré induced electronic structure modifications in monolayer V${}_2$S${}_3$ on Au(111)
• Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
• Emergent Quantum Phenomena of Noncentrosymmetric Charge-Density Wave in 1T-Transition Metal Dichalcogenides
• Quantum Phases and Spin Liquid Properties of 1T-TaS2
• Comment on "Identification of the Mott Insulating Charge Density Wave State in $1T$-TaS${}_2$"
• The rich structural, electronic and bonding landscape of 1$T$-type TaTe${}_2$ single-layers
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
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• Atomic structures and electronic correlation of monolayer 1T-TaSe2
• Dynamical control of Coulomb interactions and Hubbard bands in monolayer 1T-TaS${}_2$
• Strongly Enhanced Charge-Density Waves and Correlated Insulating State in Atomically Thin 1$T$-TaS${}_2$
• Emergent quantum phenomena in two-dimensional 1T-TaS2
• Layer controlled orbital selective Mott transition in monolayer nickelate
• Designer quantum matter in van der Waals heterostructures
• Triplet resonating valence bond theory and transition metal chalcogenides