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Charge density wave order in 1D mirror twin boundaries of single-layer MoSe 2

  • Author(s): Barja, S;
  • Wickenburg, S;
  • Liu, ZF;
  • Zhang, Y;
  • Ryu, H;
  • Ugeda, MM;
  • Hussain, Z;
  • Shen, ZX;
  • Mo, SK;
  • Wong, E;
  • Salmeron, MB;
  • Wang, F;
  • Crommie, MF;
  • Ogletree, DF;
  • Neaton, JB;
  • Weber-Bargioni, A
  • et al.

Published Web Location

https://doi.org/10.1038/nphys3730
Abstract

We provide direct evidence for the existence of isolated, one-dimensional charge density waves at mirror twin boundaries (MTBs) of single-layer semiconducting MoSe 2. Such MTBs have been previously observed by transmission electron microscopy and have been predicted to be metallic in MoSe 2 and MoS 2. Our low-temperature scanning tunnelling microscopy/spectroscopy measurements revealed a substantial bandgap of 100 meV opening at the Fermi energy in the otherwise metallic one-dimensional structures. We found a periodic modulation in the density of states along the MTB, with a wavelength of approximately three lattice constants. In addition to mapping the energy-dependent density of states, we determined the atomic structure and bonding of the MTB through simultaneous high-resolution non-contact atomic force microscopy. Density functional theory calculations based on the observed structure reproduced both the gap opening and the spatially resolved density of states.

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