Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$

Abstract

We study the impact of Cu intercalation on the charge density wave (CDW) in 1T-Cu${}_{\text{x}}$TiSe${}_{\text{2}}$ 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$<$0.02) and a breaking up of the commensurate order into 2$\times$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.

5 pages, 4 figures

References in corpus (7)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Controlling many-body states by the electric-field effect in a two-dimensional material
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
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• Doping nature of native defects in 1T-TiSe2
• Point-contact tunneling spectroscopy measurement of Cu${}_x$TiSe${}_2$: disorder-enhanced Coulomb effects

Cited by in corpus (16)

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• Charge Density Wave and Ferromagnetism in Intercalated CrSBr
• Local resilience of the $1T$-TiSe${}_2$ charge density wave to Ti self-doping
• Orbital-collaborative Charge Density Wave in Monolayer VTe2
• Diversity of charge orderings in correlated systems
• Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives
• Extended Falicov-Kimball model: Exact solution for finite temperatures
• Carrier-Density Control of the Quantum-Confined 1$T$-TiSe${}_2$ Charge-Density-Wave
• Extended Falicov-Kimball model: Hartree-Fock vs DMFT approach
• Transport anomalies in the layered compound BaPt4Se6
• Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe${}_2$
• Building bridges: matching density functional theory with experiment
• Doping-induced nematic and stripe orders within the charge density wave state of TiSe${}_2$
• Multiband charge density wave exposed in a transition metal dichalcogenide