Emergent Novel Metallic State in a Disordered 2D Mott Insulator

Abstract

It is well established that for non-interacting electrons, increasing disorder drives a metal into a gapless localized Anderson insulator. While in three dimensions a threshold in disorder must be crossed for the transition, in two dimensions and lower, the smallest amount of disorder destabilizes the metal. The nature of the metal-insulator transition in an interacting system remains unresolved. Here we explore the effect of disorder on a strongly correlated Mott insulator without changing the carrier concentration. Angle resolved photoemission spectroscopy (ARPES) measurements on copper intercalated single crystals of the layered dichalcogenide 1T-TaS2 reveal the presence of new delocalized states within the Mott gap. This is the first experimental realization of a novel disorder-induced metal that was theoretically predicted to exist between the Mott insulator and Anderson insulator.

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Cited by in corpus (38)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• A metallic mosaic phase and the origin of Mott insulating state in 1T-TaS2
• Nanoscale manipulation of the Mott insulating state coupled to charge order in 1T-TaS2
• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Orbital-driven Mottness collapse in 1T-TaS2-xSex transition metal dichalcogenide
• Correlated electronic states at domain walls of a Mott-charge-density-wave insulator 1T-TaS2
• Interplay of electron-electron and electron-phonon interactions in the low temperature phase of 1T-TaS2
• Distinguishing a Mott Insulator from a Trivial Insulator with Atomic Adsorbates
• Effect of Stacking Order on the Electronic State of 1T-TaS${}_2$
• Possible strain induced Mott gap collapse in 1T-TaS${}_2$
• Semiclassical dynamics of spin density waves
• Disorder induced power-law gaps in an insulator-metal Mott transition
• Non Fermi liquid behavior and continuously tunable resistivity exponents in the Anderson-Hubbard model at finite temperature
• Realization of metallic state in 1T-TaS2 with persisting long-range order of charge density wave
• Critical Behavior in Doping-Driven Metal$-$Insulator Transition on Single-Crystalline Organic Mott-FET
• Formation of an incoherent metallic state in Rh-doped Sr${}_2$IrO${}_4$
• Reconcile the Bulk Metallic and Surface Insulating state in 1T-TaSe${}_2$
• Competition between disorder and Coulomb interaction in a two-dimensional plaquette Hubbard model
• Local Spectroscopies Reveal Percolative Metal in Disordered Mott Insulators
• Disorder and interactions in systems out of equilibrium: The exact independent-particle picture from density functional theory
• Machine learning predictions for local electronic properties of disordered correlated electron systems
• Quantum ferromagnet in the proximity of the tricritical point
• Nonequilibrium DMFT+CPA for Correlated Disordered Systems
• Pseudogap and weak multifractality in disordered Mott charge-density-wave insulator
• Model Hamiltonian for strongly-correlated systems: Systematic, self-consistent, and unique construction
• Appearance of a Domain Structure and its Electronic states in Iron Doped 1$T$-TaS${}_2$ Observed using Scanning Tunneling Microscopy and Spectroscopy
• Mobile Kink Solitons in a Van der Waals Charge-Density-Wave Layer
• Disorder-controlled relaxation in a 3D Hubbard model quantum simulator
• Anderson localization effects on doped Hubbard model
• Thermodynamics of the disordered Hubbard model studied via numerical linked-cluster expansions
• Supersolid Phase in the Diluted Holstein Model
• Hidden electronic phase in strained few-layer 1T-TaS2
• Probing enhanced superconductivity in van der Waals polytypes of V${}_x$TaS${}_2$
• Probing complex stacking in a layered material via electron-nuclear quadrupolar coupling
• Ramp reversal memory in bulk crystals of 1T-TaS2
• Transport and spectroscopic signatures of a disorder-stabilized metal in two-dimensional frustrated Mott insulators
• Strongly correlated zero-bias anomaly in double quantum dot measurements
• Spectroscopic evidence of disorder-induced quantum phase transitions in monolayer Fe(Te,Se) superconductor