Journal article

Scanning tunneling microscopy of the charge density wave in $1T-{\mathrm{TiSe}}_{2}$ in the presence of single atom defects

  • Novello, Anna M. Department of Quantum Matter Physics, University of Geneva, Switzerland
  • Hildebrand, Baptiste Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Scarfato, A. Department of Quantum Matter Physics, University of Geneva, Switzerland
  • Didiot, Clément Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Monney, Gaël Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Ubaldini, A. Department of Quantum Matter Physics, University of Geneva, Switzerland
  • Berger, Helmuth Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
  • Bowler, D. R. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, United Kingdom
  • Aebi, Philipp Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
  • Renner, Christoph Department of Quantum Matter Physics, University of Geneva, Switzerland
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    04.08.2015
Published in:
  • Physical Review B. - 2015, vol. 92, no. 8, p. 081101
English We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge density wave (CDW) in $1T-{\mathrm{TiSe}}_{2}$ in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with native defect concentrations where some bulk probes already measure substantial reductions in the CDW phase transition signature. A systematic analysis of STM micrographs combined with density functional theory modeling of atomic defect patterns indicate that the observed CDW modulation lies in the Se surface layer. The defect patterns clearly show there are no 2H-polytype inclusions in the CDW phase, as previously found at room temperature [A. N. Titov et al., Phys. Solid State 53, 1073 (2011)]. They further provide an alternative explanation for the chiral Friedel oscillations recently reported in this compound [J. Ishioka et al., Phys. Rev. B 84, 245125 (2011)].
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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https://folia.unifr.ch/unifr/documents/304589
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