We study the electron transport properties through a supported organic molecule styrene (C8H8) on... more We study the electron transport properties through a supported organic molecule styrene (C8H8) on an ideal silicon surface Si[111] and probed by a STM-tip. The I-V characteristics and the dierential conductance of the molecule are calculated using a self consistent approach based on non equilibrium Green’s functions. Two dierent adsorption congurations
Low-temperature scanning tunneling spectroscopy allows to probe the electronic properties of clus... more Low-temperature scanning tunneling spectroscopy allows to probe the electronic properties of clusters at surfaces with unprecedented accuracy. By means of quantum transport theory, using realistic tunneling tips, we obtain differential conductance curves which considerably deviate from the cluster's density of states. Our study explains the remarkably small number of peaks in the conductance spectra observed in recent experiments. We demonstrate that the unambiguous characterization of the states on the supported clusters can be achieved with energy-resolved images, which we are able to construct with a complete simulation of the experimental imaging procedure.
We study the electron transport properties through a supported organic molecule styrene (C8H8) on... more We study the electron transport properties through a supported organic molecule styrene (C8H8) on an ideal silicon surface Si(111) and probed by a STM-tip. The I-V characteristics and the dierential conductance of the molecule are calculated using a self consistent approach based on non equilibrium Green's functions. Two dierent adsorption congurations
ABSTRACT The influence of the supporting surface on the standing wave electronic modes of finite ... more ABSTRACT The influence of the supporting surface on the standing wave electronic modes of finite metallic carbon nanotubes (CNTs) is discussed. The charge distribution of the states is visualized by simulating the energy resolved scanning tunneling spectroscopy (STS) maps. The Fourier transform of the spatial patterns exhibited by the STS maps allows to reconstruct the dispersion relation, whose definiteness is smeared out for increasing surface-tube interaction strengths. The scattering of the modes in the tube due to the interaction with the surface causes distortions of the simulated maps. For example, the reflection symmetry with respect to the mirror plane perpendicular to the tube axis appears to be broken for modes in the case of narrow tubes, when the interaction with the surface is strong enough. [GRAPHICS] Breaking of the reflection symmetry: STS map for a (4,4) carbon nanotube of length 50a(0) near the Fermi level placed at 2.5 angstrom (upper tube) and 3.0 angstrom (lower tube) away from an Au(111) surface. Red, green, and blue colored regions refer to large, intermediate and low values of the current, respectively. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2000
Time series resulting from wave decomposition show the existence of different correlation pattern... more Time series resulting from wave decomposition show the existence of different correlation patterns for avalanche dynamics. For the d=2 Bak-Tang-Wisenfeld model, long range correlations determine a modification of the wave size distribution under coarse graining in time, and multifractal scaling for avalanches. In the Manna model, the distribution of avalanche coincides with that of waves, which are uncorrelated and obey finite size scaling, a result expected also for the d=3 Bak-Tang-Wiesenfeld sandpile.
We study the electron transport properties through a supported organic molecule styrene (C8H8) on... more We study the electron transport properties through a supported organic molecule styrene (C8H8) on an ideal silicon surface Si[111] and probed by a STM-tip. The I-V characteristics and the dierential conductance of the molecule are calculated using a self consistent approach based on non equilibrium Green’s functions. Two dierent adsorption congurations
Low-temperature scanning tunneling spectroscopy allows to probe the electronic properties of clus... more Low-temperature scanning tunneling spectroscopy allows to probe the electronic properties of clusters at surfaces with unprecedented accuracy. By means of quantum transport theory, using realistic tunneling tips, we obtain differential conductance curves which considerably deviate from the cluster's density of states. Our study explains the remarkably small number of peaks in the conductance spectra observed in recent experiments. We demonstrate that the unambiguous characterization of the states on the supported clusters can be achieved with energy-resolved images, which we are able to construct with a complete simulation of the experimental imaging procedure.
We study the electron transport properties through a supported organic molecule styrene (C8H8) on... more We study the electron transport properties through a supported organic molecule styrene (C8H8) on an ideal silicon surface Si(111) and probed by a STM-tip. The I-V characteristics and the dierential conductance of the molecule are calculated using a self consistent approach based on non equilibrium Green's functions. Two dierent adsorption congurations
ABSTRACT The influence of the supporting surface on the standing wave electronic modes of finite ... more ABSTRACT The influence of the supporting surface on the standing wave electronic modes of finite metallic carbon nanotubes (CNTs) is discussed. The charge distribution of the states is visualized by simulating the energy resolved scanning tunneling spectroscopy (STS) maps. The Fourier transform of the spatial patterns exhibited by the STS maps allows to reconstruct the dispersion relation, whose definiteness is smeared out for increasing surface-tube interaction strengths. The scattering of the modes in the tube due to the interaction with the surface causes distortions of the simulated maps. For example, the reflection symmetry with respect to the mirror plane perpendicular to the tube axis appears to be broken for modes in the case of narrow tubes, when the interaction with the surface is strong enough. [GRAPHICS] Breaking of the reflection symmetry: STS map for a (4,4) carbon nanotube of length 50a(0) near the Fermi level placed at 2.5 angstrom (upper tube) and 3.0 angstrom (lower tube) away from an Au(111) surface. Red, green, and blue colored regions refer to large, intermediate and low values of the current, respectively. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2000
Time series resulting from wave decomposition show the existence of different correlation pattern... more Time series resulting from wave decomposition show the existence of different correlation patterns for avalanche dynamics. For the d=2 Bak-Tang-Wisenfeld model, long range correlations determine a modification of the wave size distribution under coarse graining in time, and multifractal scaling for avalanches. In the Manna model, the distribution of avalanche coincides with that of waves, which are uncorrelated and obey finite size scaling, a result expected also for the d=3 Bak-Tang-Wiesenfeld sandpile.
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Papers by Mario de Menech