441 research outputs found
Naturalis Historia di Plinio il Vecchio
No full textEdizione latino-italiana della Naturalis historia di Plinio il Vecchio.
Coordinatori scientifici: Emilio Gabba, Alberto Grilli, Paolo Maggi, Claudio Moreschini, Sergio Lazzarin
Sulla direzione di causalità tra finanziamenti esterni di private equity e crescita d’impresa: uno studio sulle giovani imprese hightech italiane
No full textSingle-particle spectra and Fermi surface near a stripe instability
No full textWe analyze the single-particle spectra of a model for electrons coupled to critical charge and spin fluctuations near a stripe instability. We compare our results with ARPES experiments on the cuprate superconductors near optimum doping and discuss the puzzling absence of band splitting in bi-layered compounds
The causality relationship between external private equity financing and the growth of new technology-based firms
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Doping-driven transition to a time-reversal breaking state in the phase diagram of the cuprates
No full textMotivated by recent tunneling and Andreev-reflection experiments, we study the conditions for a quantum transition within the superconducting phase of the cuprates, in which a bulk imaginary (time-reversal breaking) id(xy) component appears in addition to the d(x)(2)-y(2) order parameter. We examine in detail the role of some important physical features of the cuprates. In particular we show that a closed Fermi surface, a bilayer splitting, an orthorhombic distortion, and the proximity to a quantum critical point around optimal doping favor the appearance of the imaginary component. These findings could explain why the mixed d(x)(2)-y(2)+id(xy) order parameter is observed in Y1-yCayBa2Cu3O7-x and La2-xSrxCuO4, and suggest that it could appear also in Bi2Sr2CaCu2O8. We also predict that, in all cuprates, the mixed state should be stable only in a limited doping region all contained beneath the d(x)(2)-y(2) dome. The behavior of the specific heat at the secondary transition is discussed. RI Grilli, Marco/C-6309-2009; Capone, Massimo/A-7762-200
Strong correlation, electron-phonon interaction and critical fluctuations: isotope effect, pseudogap formation, and phase diagram of the cuprates
No full textOn the Superconducting Critical Temperature of Heavily Disordered Interfaces Hosting Multi-Gap Superconductivity
No full textLaAlO3/SrTiO3 interfaces are a nice example of a two-dimensional electron gas, whose carrier density can be varied by top-and back-gating techniques. Due to the electron confinement near the interface, the two-dimensional band structure is split into sub-bands, and more than one sub-band can be filled when the carrier density increases. These interfaces also host superconductivity, and the interplay of two-dimensionality, multi-band character, with the possible occurrence of multi-gap superconductivity and disorder calls for a better understanding of finite-bandwidth effects on the superconducting critical temperature of heavily disordered multi-gap superconductors
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