Speaker
Mr
Baptiste Hildebrand
(University of Fribourg)
Description
The transition metal dichalcogenide 1$T$-TiSe$_2$ is a quasi-two-dimensional layered material that undergoes a commensurate 2 $\times$ 2 $\times$ 2 charge density wave (CDW) transition with a weak periodic lattice distortion (PLD) below $T_{\text{CDW}}$ $\approx$ 200 K. Scanning tunneling microscopy (STM) combined with intentionally introduced interstitial Ti atoms allow, for the first time, to bypass the resolution limitation of STM and to intimately probe the surface PLD. This study opens a new avenue for STM to access the directions of the three-dimensional atomic displacements of the PLD and directly questions recent claims of a chiral CDW phase.
Primary author
Mr
Baptiste Hildebrand
(University of Fribourg)
Co-authors
Dr
Thomas Jaouen
(University of Fribourg)
Ms
Marie-Laure Mottas
(University of Fribourg)
Mr
Gaël Monney
(University of Fribourg)
Dr
Céline Barreteau
(University of Geneva)
Dr
Enrico Giannini
(University of Geneva)
Prof.
David R. Bowler
(University College London)
Prof.
Philipp Aebi
(University of Fribourg)
