Charge Density Wave Vortex Lattice Observed in Graphene-Passivated 1T-TaS<sub>2</sub> by Ambient Scanning Tunneling Microscopy.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34231367.
- Also identified by DOI 10.1021/acs.nanolett.1c01655.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The nearly commensurate charge density wave (CDW) excitations native to the transition-metal dichalcogenide crystal, 1T-TaS<sub>2</sub>, under ambient conditions are revealed by scanning tunneling microscopy (STM) and spectroscopy (STS) measurements of a graphene/TaS<sub>2</sub> heterostructure. Surface potential measurements show that the graphene passivation layer prevents oxidation of the air-sensitive 1T-TaS<sub>2</sub> surface. The graphene protective layer does not however interfere with probing the native electronic properties of 1T-TaS<sub>2</sub> by STM/STS, which revealed that nearly commensurate CDW hosts an array of vortex-like topological defects. We find that these topological defects organize themselves to form a lattice with quasi-long-range order, analogous to the vortex Bragg glass in type-II superconductors but accessible in ambient conditions.