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

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