Emergent honeycomb network of topological excitations in correlated charge density wave

Jae Whan Park, Gil Young Cho, Jinwon Lee and Han Woong Yeom ()
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Jae Whan Park: Institute for Basic Science (IBS)
Gil Young Cho: Pohang University of Science and Technology
Jinwon Lee: Institute for Basic Science (IBS)
Han Woong Yeom: Institute for Basic Science (IBS)

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: 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 Z3 vortices, in the nearly commensurate Mott charge-density wave (CDW) phase of 1T-TaS2. 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.

Date: 2019
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DOI: 10.1038/s41467-019-11981-5

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