Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 29: Poster: 2D Materials
O 29.16: Poster
Dienstag, 19. März 2024, 12:30–14:30, Poster A
Can we disentangle the electronic contribution from the surface corrugation of the charge density wave in 2H-NbSe2? — •Nikhil Seeja Sivakumar1, Joost Aretz1, Sebastian Scherb1, Marion van Midden Mavric2, Nora Huijgen1, Umut Kamber3, Daniel Wegner1, Alexander Ako Khajetoorians1, Malte Rösner1, and Nadine Hauptmann1 — 1Institute of Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Condensed matter physics department, Jozef Stefan Institute, Ljubljana, Slovenia — 3Department of Physics, Princeton University, USA
A charge density wave (CDW) is a collective phenomenon present in many quantum materials. Currently, the formation mechanism of the CDW in 2H-NbSe2 is understood to originate from momentum and orbital dependent electron phonon coupling. Still, there are open questions regarding the involved bands and the role of Se atoms in the formation of the CDW. Here we utilize combined Scanning Tunnelling Microscopy (STM) and non-contact Atomic Force Microscopy (nc-AFM) to independently characterize the geometric as well as the electronic structure of the CDW in 2H-NbSe2. Distance-dependent current and frequency shift images reveal a different evolution of the relative contrast of the atomic and CDW periodicities. We utilize Scanning Tunnelling Spectroscopy to characterize the electronic structure close to the Fermi level. We compare the experimental results with ab-initio calculations of the energy and momentum-resolved charge density.
Keywords: STM; ncAFM; charge density wave (CDW); vdW materials; electron correlation