ISMO

Institut des Sciences Moléculaires d'Orsay


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Accueil > Équipes scientifiques > Nanophysique et Surfaces (Nanophys) > Recherche > Nano-dispositifs moléculaires > Nanodispositifs Moléculaires sur surface - (STM basse température) > MND AXIS

Axe MND

MND AXIS

par Riedel Damien - 24 février 2019 (modifié le 20 mars)

Leader : Damien RIEDEL
Former Phd students : Mayssa Yengui, Hatem Labidi, Franco Chiaravalotti, Amandine Bellec,
contact : Damien RIEDEL (damien.riedel at u-psud.fr)
Projects :
CHACRA (Charge transfer in small molecular devices) ANR
ATERSIIQ (Erbium adatoms on silicon surface for quantum information) LABEX PALM
BOQUAT (Quantum dot on silicon for the study of atomic scale qubits) LABEX PALM
COMISS (Contacting molecules on insulating surfaces at metallic silicide nano-islands) NFS

The Molecular Nanodevices Research Axis ACTIVITIES

Our research is devoted to the study of individual molecule and molecular architectures that are adsorbed on semiconductor surfaces for the development of model devices.

HIGHLIGHTS_______________________________________________________________________________________________

For more info go to => www.mnd-sciences.com


« Optoelectronic Readout of Single Er Adatoms’ Electronic States Adsorbed on the Si(100) Surface at Low Temperature (9 K) »

Integrating nanoscale optoelectronic functions is vital for applications such as optical emitters, detectors, and quantum information. Lanthanide atoms show great potential in this endeavor due to their intrinsic transitions. Here, we investigate Er adatoms on Si(100)-2x1 at 9 K using a scanning tunneling microscope (STM) coupled to a tunable laser. Er adatoms display two main adsorption configurations that are optically excited between 800 and 1200 nm while the STM reads the resulting photocurrents. Our spectroscopic method reveals that various photocurrent signals stem from the bare silicon surface or Er adatoms. Additional photocurrent peaks appear as the signature of the Er adatom relaxation, triggering efficient dissociation of nearby trapped excitons. Calculations using density functional theory with spin-orbit coupling correction highlight the origin of the observed photocurrent peaks as specific 4f -> 4f or 4f -> 5d transitions. This spectroscopic technique can facilitate optoelectronic analysis of atomic and molecular assemblies by offering insight into their intrinsic quantum properties.