Influence of Domain Walls in the Incommensurate Charge Density Wave State of Cu Intercalated 1T−TiSe2

2016/09/30 by Shichao Yan, Davide Iaia, E. Morosan +4
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Charge density wave #Condensed matter physics #Domain (mathematical analysis) #Materials science #Molecular Junctions and Nanostructures #Order (exchange) #Organic and Molecular Conductors Research #Physics #Quantum mechanics #Quantum tunnelling #Scanning tunneling microscope #Spectroscopy #Superconductivity #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.118.106405

published as Phys. Rev. Lett. 118, 106405 (2017) · 5 pages, 4 figures, Supplemental materials not included

openalex created_date 2016/10/07 · arxiv created 2017/03/10 · openalex publication_date 2017/03/10 · arxiv updated 2017/03/14 · openalex updated_date 2026/08/05

Abstract

We report a low-temperature scanning tunneling microscopy study of the charge density wave (CDW) order in 1T-TiSe₂ and Cu_0.08TiSe₂. In pristine 1T-TiSe₂ we observe a long-range coherent commensurate CDW (CCDW) order. In contrast, Cu_0.08TiSe₂ displays an incommensurate CDW (ICDW) phase with localized CCDW domains separated by domain walls. Density of states measurements indicate that the domain walls host an extra population of fermions near the Fermi level which may play a role in the emergence of superconductivity in this system. Fourier transform scanning tunneling spectroscopy studies suggest that the dominant mechanism for CDW formation in the ICDW phase may be electron-phonon coupling.

Citations

• Evolution of the Electronic Structure of1T−CuxTiSe2
• Evidence for an Excitonic Insulator Phase in1T−TiSe2
• Imaging Quasiparticle Interference in Bi 2 Sr 2 CaCu 2 O 8+δ
• Electronic liquid-crystal phases of a doped Mott insulator
• An alternative interpretation of recent ARPES measurements on TiSe 2
• Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2