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Wyszukujesz frazę "Avella, A." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Anomalous Self-Energy Features in the 2D Hubbard Model
    Autorzy:
    Avella, A.
    Mancini, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813757.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.27.+a
    71.10.-w
    Opis:
    The electronic self-energy of the two-dimensional Hubbard model, computed in the non-crossing approximation within the composite operator method, is studied as a function of frequency as well as temperature at the Fermi surface, for a value of doping at which the pseudogap is already well developed. For values of momentum belonging to the phantom arc of the Fermi surface, both dependences show anomalous power law behavior in contrast to that expected from the Fermi liquid theory.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 395-398
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frustration-Driven Quantum Phase Transition in the 1D Extended Anisotropic Heisenberg Model
    Autorzy:
    Plekhanov, E.
    Avella, A.
    Mancini, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813777.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.30.Kz
    75.10.Pq
    75.40.Mg
    Opis:
    By using density matrix renormalization group technique we study the 1D extended anisotropic Heisenberg model. We find that starting from the ferromagnetic phase, the system undergoes two quantum phase transitions induced by frustration. By increasing the next-nearest-neighbor interaction, the ground state of the system changes smoothly from a completely polarized state to a next-nearest-neighbor correlated one. On the contrary, letting the in-plane interaction to be greater than the out-of-plane one, the ground state changes abruptly.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 429-432
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model
    Autorzy:
    Avella, A.
    Mancini, F.
    Scelza, G.
    Chaturvedi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813770.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.-w
    71.10.Fd
    71.27.+a
    Opis:
    We study the two-orbital Hubbard model in the limit of vanishing kinetic energy. The phase diagram in the V-J plane, with V and J denoting the interorbital hybridization and exchange coupling respectively, at half filling is obtained. A singlet(dimer)-triplet transition is found for a critical value of the ratio V/J. The entropy of formation, both in the mode and in the particle pictures, presents a jump at the same critical line in conformity with the suggested relation between criticality and entanglement.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 417-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay Between Spin-Orbit Coupling and Structural Deformations in Heavy Transition-Metal Oxides with Tetrahedral Coordination
    Autorzy:
    Forte, F.
    Guerra, D.
    Avella, A.
    Autieri, C.
    Romano, A.
    Noce, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030491.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ej
    75.25.Dk
    71.27.+a
    Opis:
    We analyze the effects of a large spin-orbit coupling on the magnetic state of a d¹ transition-metal ion located in a tetrahedral environment. While in the ideal tetrahedral symmetry the spin-orbit coupling acts only as a perturbation on the atomic energy levels set by the crystal-field splitting, we demonstrate that its effects are strongly enhanced in the case of distorted geometries. In particular, we consider the specific case in which the tetrahedron is compressed along the z direction, and show that, by increasing the degree of flattening, a large spin-orbit interaction (i) can induce a substantial anisotropic, unquenched orbital momentum and (ii) can affect the hierarchy of the lowest energy levels that are involved in the magnetic exchange.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 394-397
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multinanosensors Based on MWCNTs and Biopolymer Matrix - Production and Characterization
    Autorzy:
    Tomova, A.
    Gentile, G.
    Grozdanov, A.
    Errico, M.
    Paunović, P.
    Avella, M.
    Dimitrov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030087.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    sensors
    actuators
    composites
    nanotubes
    properties and characterization
    Opis:
    This study presents the results of the design and characterization of a gas sensor with PMMA/CNTs chemiresistor as sensing element for detection of organic vapors. Multi wall carbon nanotubes (MWCNTs) produced at our lab (by method of pyrolysis, outer diameter d=10÷40 nm, purity ≈94%) were incorporated into biocompatible polymer matrix. Poly(methyl methacrylate) - PMMA - and nanocomposite films were obtained using casting solution technique. Produced nanocomposite films were investigated with thermogravimetric analysis, differential scanning calorimetry, X-ray analysis, scanning electron microscopy, and Fourier transform infrared, while the sensors activity was determined by the changes in electrical resistance of the nanocomposite films due to acetone and chloroform exposure. The response to these vapors was evaluated and it was shown that PMMA/MWCNTs composites exhibit changes in electroresistivity. Sensitivity was calculated to be in 0.58-54.6 range (30 min exposed to acetone) and 0.53-10.35 (30 min exposed to chloroform). The results presented in this paper show that CNTs are able to improve the overall performances of polymer based sensors.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1251-1255
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functionalization and characterization of MWCNT produced by different methods
    Autorzy:
    Tomova, A.
    Gentile, G.
    Grozdanov, A.
    Errico, M.
    Paunović, P.
    Avella, M.
    Dimitrov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070616.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.De
    Opis:
    The subject of this study is chemical functionalization as means of structural modification of multiwalled carbon nanotubes. The main goal of the experiments was to create highest density of carboxyl groups on multiwalled carbon nanotubes surface, necessary for further nanocomposite application. Two different types of multiwalled carbon nanotubes (I: outer diameter d=50÷ 100 nm, purity ≈84%, synthesized by pyrolysis and II: outer diameter d=10÷40 nm, purity ≈94%, synthesized by chemical vapor deposition) were treated by concentrated nitric acid (HNO₃) and by alkaline mixture (NH₄OH+H₂O₂). The alkaline medium as "milder" and less aggressive than nitric acid, was expected to be less destructive and cause minimal structural damage on multiwalled carbon nanotubes surface. Structural changes due to oxidation were observed by the Raman analysis, while the ratio of the intensities of the D and G peak was used to estimate the concentration of defects. Pristine and functionalized multiwalled carbon nanotubes were characterized by thermogravimetric analysis, scanning electron microscopy, ultraviolet-visible spectroscopy and zeta (ζ) spectroscopy. The results showed that functionalization initiates changes in carbon nanotubes structure as well as in their density of states. It also results in carbon nanotubes shortening and exfoliation and decreases their agglomeration tendency. Carbon nanotubes functionalized by both acid and alkaline treatment can successfully replace conventional carbon fibers as fillers in polymer composites for sensing application.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 405-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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