Speaker
Gianmarco Gatti
(University of Geneva)
Description
The interfacial coupling between electronic states in a two-dimensional system and bosonic excitations in an adjacent substrate are still poorly characterized in van der Waals heterostructures. Here, we investigate the nature of such interactions in the electronic states of a WS$_2$/hBN stack via angle-resolved photoelectron spectroscopy. We resolve dispersing satellites separated from the intense quasiparticle WS$_2$ valence band by energies comparable to Γ phonon modes in hBN. We derive a spectral function model to describe the interfacial coupling between charges in the WS$_2$ layer and the lattice vibrations of the polar hBN substrate, which we employ to provide a qualitative estimation of the interaction strength.
Authors
Anna Tamai
(Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211, Geneva, Switzerland)
Dr
Christophe Berthod
(Université de Genève)
Felix Baumberger
(Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211, Geneva, Switzerland ; Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Gianmarco Gatti
(University of Geneva)
Ms
Julia Issing
(Université de Genève)
Michael Straub
Salony Mandloi
(University of Geneva)
