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Title

Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects

Authors
Hildebrand, B.
Didiot, C.
Monney, G.
Berger, H.
Bowler, D. R.
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Published in Physical Review. B, Condensed Matter. 2015, vol. 92, no. 8, p. 081101
Abstract We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge densitywave(CDW) in 1T -TiSe2 in the presence of single atomdefects.Wefindno significant modification of the CDWlattice 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)].
Keywords Transition metal dichalcogenideCharge density waveScanning tunneling microscopy
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Research group Groupe Renner
Project FNS: 144139
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NOVELLO, Anna Maria et al. Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects. In: Physical Review. B, Condensed Matter, 2015, vol. 92, n° 8, p. 081101. https://archive-ouverte.unige.ch/unige:74694

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Deposited on : 2015-08-17

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