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Browsing by Author "Taddei, Fabio"

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Browsing by Author "Taddei, Fabio"

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  • Rainis, Diego; Taddei, Fabio; Dolcini, Fabrizio; Polini, Marco; Fazio, Rosario (American Physical Society, 2009-03-27)
    We study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tight-binding approach and the scattering formalism we show that finite-size effects lead to notable differences with respect ...
  • Venturelli, Davide (SISSA, 2011-10-27)
    Edge states are 1-dimensional transport channels, emerging in quantum wells in the integer Quantum Hall regime, with remarkable properties of chirality and quantum coherence. In this thesis we present the idea of manipulating ...
  • Giovannetti, Vittorio; Frustaglia, Diego; Taddei, Fabio; Fazio, Rosario (2007-09-05)
    We show that current correlations at the exit ports of a beam splitter can be used to detect electronic entanglement for a fairly general input state. This includes the situation where electron pairs can enter the beam ...
  • Karmakar, Biswajit; Venturelli, Davide; Chirolli, Luca; Taddei, Fabio; Giovannetti, Vittorio; Fazio, Rosario; Roddaro, Stefano; Biasiol, Giorgio; Sorba, Lucia; Pellegrini, Vittorio; Beltram, Fabio (American Physical Society, 2011-11-30)
    We introduce and experimentally demonstrate a new method that allows us to controllably couple copropagating spin-resolved edge states of a two-dimensional electron gas (2DEG) in the integer quantum Hall regime. The scheme ...
  • Giazotto, Francesco; Taddei, Fabio; Governale, Michele; Castellana, Carlo; Fazio, Rosario; Beltram, Fabio (2007-10-22)
    A solid-state cooling principle based on magnetic-field-driven tunable suppression of Andreev reflection in superconductor/two-dimensional electron gas nanostructures is proposed. This cooling mechanism can lead to very ...
  • Giazotto, Francesco; Taddei, Fabio; Beltram, Fabio; Fazio, Rosario (2007-10-22)
    We show that very large negative magnetoresistance can be obtained in magnetic trilayers in a current-in-plane geometry owing to the existence of crossed Andreev reflection. This spin-valve consists of a thin superconducting ...
  • Venturelli, Davide; Giovannetti, Vittorio; Taddei, Fabio; Fazio, Rosario; Feinberg, Denis; Usaj, G.; Balseiro, C.A. (American Physical Society, 2011-02-25)
    We investigate the coherent mixing of co-propagating edge channels in a quantum Hall bar produced by step potentials. In the case of two edge channels it is found that, although a single step induces only a few percent ...
  • Giovannetti, Vittorio; Frustaglia, Diego; Taddei, Fabio; Fazio, Rosario (2007-10-22)
    We show that multi-mode entanglement of electrons in a mesoscopic conductor can be detected by a measurement of the zero-frequency current correlations in an electronic Hong-Ou-Mandel interferometer. By this mean, one can ...
  • Giazotto, Francesco; Taddei, Fabio; Fazio, Rosario; Beltram, Fabio (2007-10-22)
    A hybrid ferromagnet-superconductor spin valve is proposed. Its operation relies on the interplay between nonequilibrium transport and proximity-induced exchange coupling in superconductors. Huge tunnel magnetoresistance ...
  • Giazotto, Francesco; Taddei, Fabio; Governale, Michele; Fazio, Rosario; Beltram, Fabio (2008-01-17)
    An electron-cooling principle based on Landau quantization is proposed for nanoscale conductor systems. Operation relies on energy-selective electron tunneling into a two-dimensional electron gas in quantizing magnetic ...
  • Giovannetti, Vittorio; Taddei, Fabio; Frustaglia, Diego; Fazio, Rosario (2008-05-14)
    We propose an architecture for implementing electronic interferometry in quantum Hall bars. It exploits scattering among parallel edge channels. In contrast to previous developments, this one employs a simply connected ...
  • Giazotto, Francesco; Taddei, Fabio; D'Amico, Pino; Fazio, Rosario; Beltram, Fabio (2007-12-14)
    We analyze the broad range of spin-dependent nonequilibrium transport properties of hybrid systems composed of a normal region tunnel coupled to two superconductors with exchange fields induced by the proximity to thin ...
  • Safaei, Shabnam; Montangero, Simone; Taddei, Fabio; Fazio, Rosario (2008-05-14)
    In adiabatic Cooper pair pumps, which are operated by means of gate voltage modulation only, the quantization of the pumped charge during a cycle is limited due to the quantum coherence of the macroscopic superconducting ...
  • Rabani, Hassan; Taddei, Fabio; Bourgeois, Olivier; Fazio, Rosario; Giazotto, Francesco (2008-08-26)
    We study the influence of superconducting correlations on the electronic specific heat in a diffusive superconductor-normal metal-superconductor Josephson junction. We present a description of this system in the framework ...
  • Splettstoesser, Janine; Governale, Michele; Koenig, Juergen; Taddei, Fabio; Fazio, Rosario (2007-09-06)
    We study adiabatic pumping through a quantum dot tunnel-coupled to one normal and one superconducting lead. We generalize a formula which relates the pumped charge through a quantum dot with Coulomb interaction to the ...
  • Silvi, Pietro; Taddei, Fabio; Fazio, Rosario; Giovannetti, Vittorio (IOP Publishing, 2011-04)
    Quantitative entanglement witnesses allow one to bound the entanglement present in a system by acquiring a single expectation value. In this paper we analyze a special class of such observables which are associated ...