Evolution of the Charge Density Wave state in Cu$_x$TiSe$_2$

ORAL

Abstract

1T-TiSe$_2$ is a quasi two-dimensional CDW material showing a 2x2x2 superlattice modulation below 200 K. Upon Cu doping the CDW is suppressed and superconductivity is induced. We present scanning tunneling microscopy and spectroscopy measurements of the charge-density wave state in 1T-TiSe$_2$, Cu$_{0.05}$TiSe$_2$ and Cu$_{0.06}$TiSe$_2$ single crystals. Topography images at 4.2 K reveal that the charge density waves are present in all samples studied, although the amplitude of the charge modulation decreases with the Cu-doping. Moreover, the chiral phase of the charge density wave is preserved also in Cu-doped samples. Tunneling spectroscopy shows that there is only a partial gap in the pure compound, with bands crossing the Fermi surface. In the Cu-doped samples the system becomes more metallic due to the increase of the chemical potential.

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Authors

  • Maria Iavarone

    Physics Department, Temple University, Philadelphia, PA 19122 USA, Temple University, Physics Department, Temple University, Philadelphia, PA 19122, USA

  • Roberto Di Capua

    Physics Department, Temple University, Philadelphia, PA 19122, USA

  • Xin Zhang

    Physics Department, Temple University, Philadelphia, PA 19122, USA

  • Maryam Golalikhani

    Physics Department, Temple University, Philadelphia, PA 19122, USA

  • Steven Moore

    Physics Department, Temple University, Philadelphia, PA 19122 USA, Physics Department, Temple University, Philadelphia, PA 19122, USA

  • Goran Karapetrov

    Physics Department, Drexel University, Philadelphia, PA 19104 USA, Physics Department, Drexel University, Drexel University, Physics Department, Drexel University, Philadelphia PA 19104, USA, Department of Physics, Drexel University and Institute of Electrical Engineering, Slovak Academy of Sciences