Unveiling the Charge Density Wave Inhomogeneity and Pseudogap State in 1T-TiSe2

Abstract

By using scanning tunneling microscopy (STM) / spectroscopy (STS), we systematically characterize the electronic structure of lightly doped 1T-TiSe2, and demonstrate the existence of the electronic inhomogeneity and the pseudogap state. It is found that the intercalation induced lattice distortion impacts the local band structure and reduce the size of the charge density wave (CDW) gap with the persisted 2x2 spatial modulation. On the other hand, the delocalized doping electrons promote the formation of pseudogap. Domination by either of the two effects results in the separation of two characteristic regions in real space, exhibiting rather different electronic structures. Further doping electrons to the surface confirms that the pseudogap may be the precursor for the superconducting gap. This study suggests that the competition of local lattice distortion and the delocalized doping effect contribute to the complicated relationship between charge density wave and superconductivity for intercalated 1T-TiSe2.

arXiv comment12 pages, 5 figures

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Cited by in corpus (5)

• Insight into the charge density wave gap from contrast inversion in topographic STM images
• Charge Density Wave and Ferromagnetism in Intercalated CrSBr
• Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
• Optical amplification in a CDW-phase of a quasi-two dimensional material
• Intercalation induced quasi-freestanding layer in TiSe${}_2$