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 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Park JW,Cho GY,Lee J,Yeom HW

doi

10.1038/s41467-019-11981-5

subject

Has Abstract

pub_date

2019-09-06 00:00:00

pages

4038

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11981-5

journal_volume

10

pub_type

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