Adsorption-induced modification of the hot electron lifetime in a Pb/Ag111 quantum well system

Abstract

The interfacial band structures of multilayer systems play a crucial role for the ultrafast charge and spin carrier dynamics at interfaces. Here, we study the energy- and momentum-dependent quasiparticle lifetimes of excited states of a lead monolayer film on Ag(111) prior and after the adsorption of a monolayer of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA). Using time-resolved two-photon momentum microscopy, we show that the electron dynamics of the bare Pb/Ag(111) bilayer system is dominated by isotropic intraband scattering processes within the quantum well state as well as interband scattering processes from the QWS into the Pb sideband. After the adsorption of PTCDA on the Pb monolayer, the interband scattering is suppressed and the electron dynamics is solely determined by intraband or inelastic scattering processes. Our findings hence uncover a new possibility to selectively tune and control scattering processes of quantum well systems by the adsorption of organic molecules.

arXiv comment9 pages, 5 figures

References in corpus (12)

• Many-body Effects in Angle-resolved Photoemission: Quasiparticle Energy and Lifetime of a Mo(110) Surface State
• Generation and evolution of spin-, valley- and layer-polarized excited carriers in inversion-symmetric WSe2
• Direct Experimental Evidence for the Hybridization of Organic Molecular Orbitals with Substrate States at Interfaces: PTCDA on Silver
• Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves
• Revealing the role of electrons and phonons in the ultrafast recovery of charge density wave correlations in 1$T$-TiSe${}_2$
• Generation of Transient Photocurrents in the Topological Surface State of Sb${}_2$Te${}_3$ by Direct Optical Excitation with Mid-Infrared Pulses
• Tracing orbital images on ultrafast time scales
• Electron-phonon coupling and its evidence in the photoemission spectra of lead
• Quantum-Well Wavefunction Localization and the Electron-Phonon Interaction in Thin Ag Nanofilms
• Electronic Structure and Dynamics of Quantum-Well States in thin Yb-Metal Films
• Efficient orbital imaging based on ultrafast momentum microscopy and sparsity-driven phase retrieval
• Ultrafast Momentum Imaging of Pseudospin-Flip Excitations in Graphene