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Open Access Publications from the University of California

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.

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© 2016 Macmillan Publishers Limited. All rights reserved. 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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