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Thèse dirigée par Klaus HASSELBACH préparée au sein du Institut Néel dans l'École Doctorale Physique Microscopie à micro-SQUID: étude de la coexistence de la supraconductivité et du ferromagnétisme dans le composé UCoGe Thèse soutenue publiquement le 15/02/2011, devant le jury composé de : Je tiens à remercier les autres thésards, notamment Germain (qui m'a(More)
the date of receipt and acceptance should be inserted later Abstract. We present a detailed model describing the effects of wire corrugation on the trapping potential experienced by a cloud of atoms above a current carrying micro wire. We calculate the distortion of the current distribution due to corrugation and then derive the corresponding roughness in(More)
We investigate the magneto-transport properties of epitaxial graphene single-layer on 4H-SiC(0001), grown by atmospheric pressure graphitization in Ar, followed by H2 intercalation. We directly demonstrate the importance of saturating the Si dangling bonds at the graphene/SiC(0001) interface to achieve high carrier mobility. Upon successful Si dangling(More)
Quasi-particle excitations in graphene exhibit a unique behavior concerning two key phenomena of mesoscopic physics: electron localization and the quantum Hall effect. A direct transition between these two states has been found in disordered two-dimensional electron gases at low magnetic field. It has been suggested that it is a quantum phase transition,(More)
We report measurements of the flux-dependent orbital magnetic susceptibility of an ensemble of 10(5) disconnected silver rings at 217 MHz. Because of the strong spin-orbit scattering rate in silver this experiment is a test of existing theories on ensemble averaged persistent currents. Below 100 mK the rings exhibit a magnetic signal with a flux periodicity(More)
Ion beam shaping is a novel and powerful tool to engineer nanocomposites with effective three-dimensional (3D) architectures. In particular, this technique offers the possibility to precisely control the size, shape and 3D orientation of metallic nanoparticles at the nanometer scale while keeping the particle volume constant. Here, we use swift heavy ions(More)
Fonctions d'onde locales dans le formalisme des liaisons fortes Soutenue le 14 décembre 2012 devant le jury composé de : Arnold et Hai son Nguyen pour leur contribution à l'ambiance et à la bonne humeur. Je remercie aussi tous les membres du LPN, et plus particulièrement les services administratifs et informatique sans qui rien ne pourrait fonctionner. 4(More)
It is known that the local conditions in an electrical circuit can affect a nearby, but electrically isolated circuit. Such a 'noninvasive' measurement technique can be employed to study the screening ability (compressibility) of an electron system. In this work, we use a quasi-one-dimensional ballistic channel to screen an electric field between a gate and(More)
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