The influence of domain walls in the incommensurate charge density wave state of Cu intercalated 1$T$-TiSe$_{\mathrm{2}}$

ORAL

Abstract

We report a low-temperature scanning tunneling microscopy study of the charge density wave (CDW) order in 1$T$-TiSe$_{\mathrm{2}}$ and Cu$_{\mathrm{0.08}}$TiSe$_{\mathrm{2}}$. In 1$T$-TiSe$_{\mathrm{2}}$ we observe a long-range coherent commensurate CDW (C-CDW) order. In contrast, Cu$_{\mathrm{0.08}}$TiSe$_{\mathrm{2}}$ displays an incommensurate CDW (I-CDW) phase with localized C-CDW 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 critical role in the emergence of superconductivity in this system. Fourier transform scanning tunneling spectroscopy studies show that the dominant mechanism for CDW formation in the I-CDW phase is electron-phonon coupling.

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Authors

  • Shichao Yan

    • University of Illinois at Urbana-Champaign, Departement of Physics
    • Department of Physics, University of Illinois
    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

  • Davide Iaia

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

  • Emilia Morosan

    • Department of Physics and Astronomy, 6100 Main Street, Rice University, Houston, TX 77005, USA

  • Eduardo Fradkin

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

  • Peter Abbamonte

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA

  • Vidya Madhavan

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA