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We report a significant and persistent enhancement of the conductivity in free-standing non-intentionally doped InAs nanowires upon irradiation in ultra-high vacuum. Combining four-point probe transport measurements performed on nanowires with different surface chemistries, field effect based measurements and numerical simulations of the electron density,(More)
Depuis l'avènement des nanotechnologies, une grande quantité de matériaux sont façonnésà l'´ echelle du nanomètre par des techniques diverses et l'intégration de ces nanostructures demande une caractérisation de leur structuré electronique. La microscopiè a effet tunnel est adaptéè a cesétudes car elle permet l'adressage de nanostructures uniques pour(More)
Two-dimensional networks of quantum dots connected by atomic bonds have an electronic structure that is distinct from that of arrays of quantum dots coupled by ligand molecules. We prepared atomically coherent two-dimensional percolative networks of PbSe quantum dots connected via atomic bonds. Here, we show that photoexcitation leads to generation of free(More)
The structural and electronic properties of nonstoichiometric low-temperature grown GaAs nanowire shells have been investigated with scanning tunneling microscopy and spectroscopy, pump-probe reflectivity, and cathodoluminescence measurements. The growth of nonstoichiometric GaAs shells is achieved through the formation of As antisite defects, and to a(More)
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