Band insulator to Mott insulator transition in 1T-TaS${}_2$

Abstract

1T-TaS${}_2$ undergoes successive phase transitions upon cooling and eventually enters an insulating state of mysterious origin. Some consider this state to be a band insulator with interlayer stacking order, yet others attribute it to Mott physics that support a quantum spin liquid state.Here, we determine the electronic and structural properties of 1T-TaS${}_2$ using angle-resolved photoemission spectroscopy and X-Ray diffraction. At low temperatures, the 2$\pi$/2c-periodic band dispersion, along with half-integer-indexed diffraction peaks along the c axis, unambiguously indicates that the ground state of 1T-TaS${}_2$ is a band insulator with interlayer dimerization. Upon heating, however, the system undergoes a transition into a Mott insulating state, which only exists in a narrow temperature window. Our results refute the idea of searching for quantum magnetism in 1T-TaS${}_2$ only at low temperatures, and highlight the competition between on-site Coulomb repulsion and interlayer hopping as a crucial aspect for understanding the material's electronic properties.

5 figures, Supplementary information

References in corpus (4)

• Two Dimensional Atomic Crystals
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Gapless excitations in the ground state of 1T-TaS${}_2$
• Band insulator to Mott insulator transition in a bilayer Hubbard model

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• Inducing and tuning Kondo screening in a narrow-electronic-band system
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• Stacking effect and Coulomb correlation in layered charge density wave phase of 1T-NbS2
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• Bilayer Hubbard model: Analysis based on the fermionic sign problem
• Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves
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• Doublon-like excitations and their phononic coupling in a Mott charge-density-wave system
• Commensurate stacking phase transitions in an intercalated transition metal dichalcogenide
• Charge order with unusual star-of-David lattice in monolayer NbTe2
• Understanding the flat band in 1T-TaS2 using a rotated basis
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• Thermal Purcell effect and cavity-induced renormalization of dissipations
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• Origin of Distinct Insulating Domains in the Layered Charge Density Wave Material 1T-TaS2
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• Spectroscopic evidence of high temperature superconductivity in VSe2
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• Controlling magnetic frustration in 1T-TaS${}_2$ via Coulomb engineered long-range interactions
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• Direct evidence of intrinsic Mott state and its layer-parity oscillation in a breathing kagome crystal down to monolayer
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• Interlayer Hopping between Surface Mott Insulator and Bulk Band Insulator in layered 1T-TaS_{2}
• Interplay of broken symmetry and delocalized excitations in the insulating state of 1$T$-TaS${}_2$
• 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
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• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
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• Time-Resolved Photoemission Spectroscopy of Quantum Materials Using High Harmonic Generation: Probing Electron-Phonon Interactions and Non-Equilibrium Dynamics
• Interlayer coupling driven phase evolution in hyperbolic $1T$-TaS${}_2$
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• Charge-Density-Wave Oscillator Networks for Solving Combinatorial Optimization Problems
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