Stripe and Short Range Order in the Charge Density Wave of 1T-Cu<sub>x</sub>TiSe<sub>2</sub>

Novello, Anna Maria; Spera, Marcello; Scarfato, Alessandro; Ubaldini, Alberto; Giannini, Enrico; Bowler, D. R.; Renner, Christoph

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Title		Stripe and Short Range Order in the Charge Density Wave of 1T-Cu_xTiSe₂
Authors		Novello, Anna Maria Spera, Marcello Scarfato, Alessandro Ubaldini, Alberto Giannini, Enrico Bowler, D. R. Renner, Christoph
Published in		Physical Review Letters. 2017, vol. 118, no. 1, p. 017002
Abstract		We study the impact of Cu intercalation on the charge density wave (CDW) in 1T-CuxTiSe2 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.
Keywords		Charge order — Stripes — Scanning tunneling microscopy — Transition metal dichalcogenides
Identifiers		DOI: 10.1103/PhysRevLett.118.017002
Full text		Article (Published version) (1.5 MB) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Research group		Groupe Renner
Projects		FNS: 144139 FNS: 162517
Citation (ISO format)		NOVELLO, Anna Maria et al. Stripe and Short Range Order in the Charge Density Wave of 1T-Cu_xTiSe₂. In: Physical Review Letters, 2017, vol. 118, n° 1, p. 017002. https://archive-ouverte.unige.ch/unige:90894