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Doctoral thesis
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Strain Dependence of the Charge Density Wave Phase Transition

ContributorsPasquier, Vincent
Imprimatur date2023
Defense date2023
Abstract

Strain, which results from the deformation of a material, is used as a tuning parameter to study the charge density wave (CDW) phase in transition metal dichalcogenides (TMDs). We have developed two bending devices to apply uniaxial or biaxial strain to low-dimensional materials. Characterization of the generated strain was performed by Raman spectroscopy on exfoliated MoS2. For each device, we observed the characteristic behavior of MoS2 Raman modes under both types of strain. The CDW in uniaxially deformed TiSe2 was studied by scanning tunneling microscopy (STM). Topographic measurements with bias dependence as a function of strain revealed a shift of the CDW contrast inversion. Since contrast inversion is determined by the position of the CDW gap, we concluded that uniaxial tensile strain pushes the CDW gap in TiSe2 towards higher negative bias.

eng
Keywords
  • Stm
  • Scanning tunneling microscopy
  • Cdw
  • Charge density wave
  • Strain
  • Tise2
  • Mos2
  • Raman
  • Strain device
  • Tmd
  • Transition metal dichalcogenides
Research group
Citation (ISO format)
PASQUIER, Vincent. Strain Dependence of the Charge Density Wave Phase Transition. 2023. doi: 10.13097/archive-ouverte/unige:169916
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Technical informations

Creation06/29/2023 10:01:20 AM
First validation07/04/2023 11:03:46 AM
Update time07/11/2023 7:38:12 AM
Status update07/11/2023 7:38:12 AM
Last indexation09/18/2023 9:46:37 PM
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