Speaker
Mr
Árpád Pásztor
(DQMP, University of Geneva)
Description
We present a detailed scanning tunneling microscopy (STM) study of the thickness and temperature dependences of the CDW order parameter in 1T-VSe$_2$. We show that mapping the real-space charge order over a broad and well-characterized thickness range, unique to STM, provides essential insight. We introduce a robust derivation of the local order parameter and transition temperature based on the real space charge modulation amplitude measured by STM. Both quantities exhibit a striking non-monotonic thickness dependence that we explain in terms of a 3D to 2D dimensional crossover in the Fermi surface topology. This finding highlights thickness as a true tuning parameter of the electronic ground state.
Authors
Mr
Árpád Pásztor
(DQMP, University of Geneva)
Dr
Alessandro Scarfato
(DQMP, University of Geneva)
Dr
Céline Barreteau
(DQMP, University of Geneva)
Dr
Enrico Giannini
(DQMP, University of Geneva)
Prof.
Christoph Renner
(DQMP, University of Geneva)
