44 resultados para SARAMAGO DE SOUZA, JOSÉ, 1922-2010

em Diposit Digital de la UB - Universidade de Barcelona


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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Materials didàctics del grup d'investigació Observatori sobre la Didàctica de les Arts (ODAS)

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Electron transport in a self-consistent potential along a ballistic two-terminal conductor has been investigated. We have derived general formulas which describe the nonlinear current-voltage characteristics, differential conductance, and low-frequency current and voltage noise assuming an arbitrary distribution function and correlation properties of injected electrons. The analytical results have been obtained for a wide range of biases: from equilibrium to high values beyond the linear-response regime. The particular case of a three-dimensional Fermi-Dirac injection has been analyzed. We show that the Coulomb correlations are manifested in the negative excess voltage noise, i.e., the voltage fluctuations under high-field transport conditions can be less than in equilibrium.

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We have analyzed the shot noise of electron emission under strong applied electric fields within the Landauer-Bttiker scheme. In contrast to the previous studies of vacuum-tube emitters, we show that in new generation electron emitters, scaled down to the nanometer dimensions, shot noise much smaller than the Schottky noise is observable. Carbon nanotube field emitters are among possible candidates to observe the effect of shot-noise suppression caused by quantum partitioning.

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We investigate the shot noise of nonequilibrium carriers injected into a ballistic conductor and interacting via long-range Coulomb forces. Coulomb interactions are shown to act as an energy analyzer of the profile of injected electrons by means of the fluctuations of the potential barrier at the emitter contact. We show that the details in the energy profile can be extracted from shot-noise measurements in the Coulomb interaction regime, but cannot be obtained from time-averaged quantities or shot-noise measurements in the absence of interactions.