AI Article Synopsis
- The study investigates how the insertion of copper (Cu) affects the charge density wave (CDW) in a compound known as 1T-Cu_{x}TiSe_{2} using techniques like scanning tunneling microscopy.
- Copper atoms randomly intercalate in the material, doping it with delocalized electrons, but the overall pattern of the CDW remains unchanged despite changes in Cu content.
- At lower Cu concentrations, charge stripe domains form, while higher concentrations lead to smaller 2×2 domains that shift in phase, challenging the idea that excitonic pairing is the main driver behind CDW formation in this material.
Article Abstract
We study the impact of Cu intercalation on the charge density wave (CDW) in 1T-Cu_{x}TiSe_{2} by scanning tunneling microscopy and spectroscopy. Cu atoms, identified through density functional theory modeling, are found to intercalate randomly on the octahedral site in the van der Waals gap and to dope delocalized electrons near the Fermi level. While the CDW modulation period does not depend on Cu content, we observe the formation of charge stripe domains at low Cu content (x<0.02) and a breaking up of the commensurate order into 2×2 domains at higher Cu content. The latter shrink with increasing Cu concentration and tend to be phase shifted. These findings invalidate a proposed excitonic pairing as the primary CDW formation mechanism in this material.
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| http://dx.doi.org/10.1103/PhysRevLett.118.017002 | DOI Listing |
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