Image of the Electron Energy-Loss Function in Light Emitted from Tunnel Junctions

Abstract

of spin in cp should be considered). The final potential application we mentioned is the two-band Hubbard model called the Anderson-lattice model, currently the vogue in the mixed-valence problem.One of us (T.A.K.) was the recipient of an Alexander von Humboldt Senior Scientist Award. f Permanent address: Michigan State University, Synchrotron-radiation experiments were performed at ultralow (<0.1 monolayer) coverages to test the weakly-interacting-cluster model for Al adsorption on GaAs(llO). The evolution of the Al 2p peak revealed two different submonolayer adsorption states, one below and one above 0.1 monolayer coverage, as predicted by the model. These results demonstrate that experiments at ultralow coverages are crucial to the understanding of the Schottky barrier formation.

Light at the End of the Tunnel

“…Several strategies were followed in order to convert the MIM mode into photons in these early experiments. Among these were the roughening of the junction electrodes − and the use of metal nanoparticles, ,,− both of which facilitate mode conversion through random scattering. However, as each scattering event carries the possibility for absorption, outcoupling efficiencies were found to saturate with increasing roughness. ,, In an alternative approach, tunnel junctions were fabricated on top of gratings − in order to “impedance-match” the modes of the tunnel junctions to free-space (cf.…”

Light emission from gold and silver thin films in a scanning tunneling microscope: role of contamination and interpretation of grain structure in photon maps

“…Inter alia they observed quantum oscillations arising from tipsample plasmon confinement, introduced the technique of mapping photon emission from surfaces and demonstrated the influence of the dielectric function of the electrodes on the emitted light, an effect seen previously in thin film light emission [11]. Most of these early UHV studies were concentrated on spectroscopy at a fixed location on the sample surface.…”

Contribution des plasmons de surface au rayonnement lumineux émis par des jonctions tunnel MIM réalisées sur réseaux holographiques

“…Mais des désaccords profonds concernant l'intensité rayonnée, la loi de variation de cette intensité avec l'épaisseur de l'électrode externe, et son renforcement par abaissement de température, ont conduit ces mêmes auteurs à remettre en question le mécanisme d'excitation des OPS, et montrent que l'excitation des OPS provient essentiellement d'un couplage direct entre électrons chauds et ondes de surface, localisé dans l'électrode externe [24]. Cette hypothèse, plus réaliste que la précédente, avait déjà été émise en 1980 par Kroô et al [19], et est confirmée par d'autres publications qui observentdans des diodes MIM à rugosité aléatoireque l'intensité rayonnée dépend étroitement des pertes d'énergie subies par les électrons dans le métal de l'électrode externe [25,26].…”