High-resolution STM imaging and spectroscopy of Cu$_{x}$TiSe$_{2}$

ORAL

Abstract

The discovery of superconductivity in Cu-doped TiSe$_{2}$ has created a new opportunity to study the competition between charge density wave (CDW) formation and superconductivity in layered chalcogenides [1]. Using a cryogenic scanning tunneling microscope (STM), we have obtained atomic resolution images of \textit{in situ} cleaved Cu$_{x}$TiSe$_{2}$ and perform spatially resolved mapping of the electronic states of this compound. The STM images measured on samples at low Cu doping, reveal the atomic lattice, the CDW organization, and show local signatures consistent with individual Cu-dopants. Imaging and spectroscopy are used to identify how the Cu-dopants alter the local electronic structure of this material and destroy the CDW organization, which eventually gives way to the rise of superconductivity. [1] E. Morosan \textit{et al}., \textit{Nature Physics} \textbf{2}, 544 (2006).

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Authors

  • Dale Kitchen

    Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University, Princeton Nanoscale Microscopy Laboratory, Department of Physics, Princeton University

  • Kenjiro K. Gomes

    Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University

  • Abhay Pasupathy

    Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University

  • Aakash Pushp

    Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University, Princeton Nanoscale Microscopy Laboratory, Department of Physics, Princeton University, NJ US

  • Pedram Roushan

    Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University

  • Emilia Morosan

    Department of Chemistry, Princeton University

  • R.J. Cava

    Princeton University, Princeton Univ., Department of Chemistry, Princeton University, Department of Chemistry, Princeton University, Princeton, NJ 08540, USA, Department of Chemistry, Princeton University, Princeton NJ 08544, USA

  • Ali Yazdani

    Princeton University, Princeton Nanocale Microscopy Laboratory, Department of Physics, Princeton University, Princeton Nanoscale Microscopy Laboratory, Department of Physics, Princeton University