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• W628637853 abstract "The scope of this thesis is related to the electronic properties of quasi 1D systems probed by highfield magnetotransport. Two different systems exhibiting quasi-1D confinement have beenconsidered: carbon C60 peapods (C60@SWCNTs) and InAs semiconductor nanowires. Themagnetotransport measurements on single nano-objets have been used to investigate the specificelectronic structure of these 1D systems. In both cases, the high magnetic fields experimentshave been supported by structural characterisation and conductance measurements at zero field.The encapsulation of various molecules inside carbon nanotubes (CNTs), as for instance C60fullerenes encapsulated in SWCNT, constitutes promising routes towards the tunability of theCNT conductance. Among the wide variety of filled CNTs, peapods represent a pioneer hybridstructure discovered in 1998. Since that time, their electronic structure has been subjected tointense and controversial theoretical studies together with a limited number of experimentalrealizations. In this thesis the electronic properties of individual fullerene peapods have beeninvestigated by combining micro-Raman spectroscopy and magnetotransport measurements onthe same devices. We bring evidence that the encapsulated C60 strongly modify the electronicband structure of semiconducting nanotubes in the vicinity of the charge neutrality point,including a rigid shift and a partial filling of the energy gap. In addition by playing with aselective UV excitation of the fullerene, we demonstrate that the electronic coupling between theC60 and the CNT is strongly modified by the partial coalescence of the C60 and their distributioninside the tube. The experimental results are supported by numerical simulations of the Densityof States and the conductance of CNTs with coalesced fullerenes inside (K. Katin, M. Maslov).Semiconductor nanowires (sc-NWs) are being the subject of intense researches started a decadeago. They represent model systems for the exploration of the electronic properties inerrant to thequasi1-D confinement. Moreover they offer the possibility to play with band structure tailoringand carrier doping. In this direction III-V sc-NWs such as InAs NWs have played a particularrole due to the small electron effective mass. We have studied the high magnetic fieldconductance of single nanowires. Prior to the high field measurements, the zero and low fieldinvestigations have demonstrated a weakly diffusive regime of the carrier transport in thesewires. The high field investigations have revealed a drastic conductance drop above a criticalfield, which clearly rises with the Fermi energy. This effect is interpreted by the loss ofconducting channels once all the magneto-electric subbands, shifted toward the high energyrange by the magnetic field, have crossed the Fermi energy. Preliminary band structurecalculations (Y-M. Niquet), taking into account the lateral and magnetic confinements, are infairly good qualitative agreement with the observed result in the high field regime. This result isthe first observation of band structure effects in magneto-transport experiments on sc-NWs." @default.
• W628637853 created "2016-06-24" @default.
• W628637853 creator A5081631381 @default.
• W628637853 date "2013-06-14" @default.
• W628637853 modified "2023-09-23" @default.
• W628637853 title "Electronic properties of quasi-one-dimensional systems (C60@SWCNTs and InAs nanowires) studied by electronic transport under high magnetic field" @default.
• W628637853 hasPublicationYear "2013" @default.
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