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Charge Instability in Single-Layer TiTe_{2} Mediated by van der Waals Bonding to Substrates.

  • Author(s): Lin, Meng-Kai;
  • Hlevyack, Joseph A;
  • Chen, Peng;
  • Liu, Ro-Ya;
  • Mo, Sung-Kwan;
  • Chiang, T-C
  • et al.
Abstract

Single layers of transition metal dichalcogenides are of interest for emergent properties; an often-neglected issue is substrate effects. Our experiments show that the charge density wave in a single-layer TiTe_{2} grown on PtTe_{2} films is strongly suppressed by increasing the PtTe_{2} substrate thickness. Given that the interfacial bonding remains of the weak incommensurate van der Waals type, the observed changes are correlated with a thickness-dependent metallicity transformation in the PtTe_{2} substrate. The results illustrate the crucial role of the substrate in single-layer physics.

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