Emergent Honeycomb Network of Topological Excitations in Correlated Charge Density Wave

Abstract

When two periodic potentials compete in materials, one may adopt the other, which straightforwardly generates topological defects. Of particular interest are domain walls in charge-, dipole-, and spin-ordered systems, which govern macroscopic properties and important functionality. However, detailed atomic and electronic structures of domain walls have often been uncertain and the microscopic mechanism of their functionality has been elusive. Here, we clarify the complete atomic and electronic structures of the domain wall network, a honeycomb network connected by Z${}_3$ vortices, in the nearly commensurate Mott charge-density wave (CDW) phase of 1T-TaS${}_2$. Scanning tunneling microscopy resolves characteristic charge orders within domain walls and their vortices. Density functional theory calculations disclose their unique atomic relaxations and the metallic in-gap states confined tightly therein. A generic theory is constructed, which connects this emergent honeycomb network of conducting electrons to the enhanced superconductivity.

arXiv comment5 figures

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Cited by in corpus (24)

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• Distinguishing a Mott Insulator from a Trivial Insulator with Atomic Adsorbates
• Electrical switching of ferro-rotational order in nano-thick 1T-TaS${}_2$ crystals
• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
• Zoology of domain walls in quasi-2D correlated charge density wave of 1T-TaS2
• Photocurrent Imaging of Multi-Memristive Charge Density Wave Switching in Two-Dimensional 1T-TaS2
• Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks
• Depinning of the Charge-Density Waves in Quasi-2D 1T-TaS2 Devices Operating at Room Temperature
• Flat bands and higher-order topology in polymerized triptycene: Tight-binding analysis on decorated star lattices
• Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves
• Non-Fermi Liquids in Conducting 2D Networks
• Flat-band solutions in $D$-dimensional decorated diamond and pyrochlore lattices: Reduction to molecular problem
• Mobile Kink Solitons in a Van der Waals Charge-Density-Wave Layer
• Observation and manipulation of a phase separated state in a charge density wave material
• Molecular dipoles in designer honeycomb lattices
• Stacking of charge-density waves in 2H-NbSe${}_2$ bilayers
• Quantum Phases and Spin Liquid Properties of 1T-TaS2
• Emergent Quantum Phenomena of Noncentrosymmetric Charge-Density Wave in 1T-Transition Metal Dichalcogenides
• Robust Flat Bands with Tunable Energies in Honeycomb Superlattices
• Two-dimensional charge order stabilized in clean polytype heterostructures
• Metal-to-insulator transition in Pt-doped TiSe${}_2$ driven by emergent network of narrow transport channels
• Designer quantum matter in van der Waals heterostructures