November 2019 – Combining real space and reciprocal space analysis of scanning tunneling microscopy images of transition metal dichalcogenides, we obtain real space maps of the amplitude, phase and periodicity of the complex charge density wave (CDW) order parameter. These maps show that the CDW in these materials consist of up to three coexisting unidirectional…
Group Renner
Welcome
September 2019 – Welcome to Tejas Singar who joins the group from India to start a PhD on spin polarized STM.
Welcome
September 2019 – Welcome to Dr Lihuan Sun who joins the group from China. Her expertise is in time-resolved scanning probe microscopy. She will study artificial transition metal dichalcogenide based heterostructures using scanning tunneling microscopy and spectroscopy.
PRB – Editors’ suggestion
April 2019 – Scanning tunneling microscopy unveils an unusual energy dependent CDW pattern in Cu intercalated TiSe2. It is a direct manifestation of a large doping dependent CDW gap opening below the Fermi level. Phys. Rev. B 99, 155133 (2019)
PhD Degree
April 2019 – Congratulations to Marcello Spera who successfully defended his PhD thesis on April 3, 2019. He performed a very detailed study of the charge density wave (CDW) ground state in 1T-TiSe2 by scanning tunneling microscopy. Main results include a striking energy dependent CDW patchwork and a rarely observed bias dependent contrast inversion. See…
PhD Degree
November 2018 – Congratulations to Arpad Pasztor who successfully defended his PhD thesis on November 7, 2018. He studied the thickness dependence of the charge density wave in 1T-VSe2 by scanning tunneling microscopy and developed a novel scheme to map the full complex CDW order parameter in real space. See the full text on Open…
PRL – Physics Highlight 2017
December 2017 – Detailed scanning tunneling microsccopy and spectroscopy and original model calculations reveal the long sought after Caroli-de Gennes-Matricon states in the vortex cores of a high temperature copper oxyde superconductor. Article featured in: Physics News and Commentary ScienceNews Spektrum.de Superconductor Week (by subscription) Le Journal – UNIGE La Recherche (by subscritpion – in…
2D Materials
September 2017 – Scanning tunneling microscopy of in-situ exfoliated VSe2 reveals a non monotonic thickness dependence of the charge density wave (CDW) order parameter and phase transition temperature. Both parameters are extracted directly form the charge modulation amplitude imaged in STM micrographs. This study lifts the contradictions of previous experiments claiming opposite thickness dependencies of…
Physical Review B
August 2017 – Reduced dimensions can give rise to surprising effects. While a long exposure time photograph of a macroscopic moving object appears blurred, scanning tunneling microscopy images of flipping Si dimer defects embedded in Bi-nanolines on the Si(001) surface appear much sharper than those of static ones. This counter intuitive dynamic sharpening is perfectly…
PhD Degree
June 2017 – Renan Villarreal successfully defended his PhD thesis on 16 June 2017. Toutes nos félicitations Dr Villarreal! See the full text on Open Archive.
Réalisation : Sur Mesure concept