We report transport studies on magnetically doped Bi(2)Se(3) topological insulator ultrathin films grown by molecular beam epitaxy. The magnetotransport behavior exhibits a systematic crossover between weak antilocalization and weak localization with the change of magnetic impurity concentration, temperature, and magnetic field. We show that the localization property is closely related to the m...

Dynamics of the 1D electron transport between two reservoirs are studied based on the inhomogeneous Tomonaga-Luttinger Liquid (ITLL) model in the case when the effect of the electron backscattering on the impurities is negligible. The inhomo-geneities of the interaction lead to a charge wave reflection. This effect supposes a special behavior of the transport characteristics at the microwave fr...

The electrical transport properties of single-wall carbon nanotubes are shown to be strongly influenced by the presence of transition-metal impurities derived from the catalyst introduced to stimulate their growth. Data on thermoelectric power and electrical resistance in the temperature range 10–400 K were obtained on a series of samples prepared using M -Y catalysts ~M5Cr, Mn, Co, Fe, Ni!. Th...

Temporally and spatially resolved measurements of carbon and boron impurity density are obtained in the reversed field pinch (RFP) for the first time. It is observed that, unlike in tokamaks and stellarators, the RFP does not exhibit a centrally peaked impurity profile in either standard plasmas where field lines have some degree of stochasticity, or improved confinement discharges where there ...

The contamination of core plasma by high-Z impurities, especially tungsten (W), is the main reason very high level radiated power in WEST experiments. Intrinsic light mainly oxygen and carbon, play a dominant role sputtering W on facing components. In this contribution, we present detailed analysis experiments supported numerical modeling performed with transport code SOLEDGE-EIRENE providing c...

It is shown that formation of clusters of charged impurities on graphene can suppress their contribution to the resistivity by a factor of the order of the number of impurities per cluster. The dependence of conductivity on carrier concentration remains linear. In the regime where the cluster size is large in comparison to the Fermi wavelength, the scattering cross section shows sharp resonance...

Thin films of Cs, quench condensed onto a He cold quartz plate, possess electronic mean free paths which considerably exceed the film thicknesses. When theses films are covered in situ with sub monolayers of Au, Ag, In, Rh and Pb in the range between 0.01 and 1 monolayers the film resistance and the Hall constant increase dramatically. This corresponds to a scattering cross section of the surfa...

Motivated by recent experiments by Yuri M. Zuev et al. Phys. Rev. Lett. 102, 096807 2009 , Peng Wei et al. Phys. Rev. Lett. 102, 166808 2009 , and Joseph G. Checkelsky et al. Phys. Rev. B 80, 081413 R 2009 , we calculate the thermopower of graphene incorporating the energy dependence of various transport scattering times. We find that scattering by screened charged impurities gives a reasonable...

New variational principles are developed for the e}ective heat conductivity tensor of aniso! tropic two!phase composites in the presence of coupled mass and heat transport processes at the two!phase interface[ We focus on physical situations where an imposed temperature gradient causes impurities or lattice defects to concentrate on the two!phase interface and di}use along it[ This is accompani...

We study the thermal and electric transport of a fluid of interacting Dirac fermions as they arise in single-layer graphene. We include Coulomb interactions, a dilute density of charged impurities and the presence of a magnetic field to describe both the static and the low frequency response as a function of temperature T and chemical potential μ . In the critical regime μ . T where both bands ...