Band To Band Tunneling
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Estudo de transistores de tunelamento controlados por efeito de campo. / Study of tunnel field effect transistors.
This works presents the study of tunneling field effect transistors, namely TFETs. Analyses were performed based on theoretical explanations, numerical simulations and experimental data in order to show this technology suitability as an alternative for the continuous devices scaling. The basic idea of making use of band-to-band tunneling as the main current
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2012
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2. Estruturas de barreira dupla de PbTe/PbEuTe crescidas por epitaxia de feixe molecular / PbTe/PbEuTe double barrier structures grown by molecular beam epitaxy
This work reports the growth of PbTe/Pb(1-x)Eu(x)Te double barrier (DB) structures by molecular beam epitaxial and the device processing aiming the resonant tunneling measurement. The samples were grown on (111) BaF(2) substrates at 300°C. Resistivity and Hall effect measurements were performed on reference films to determine the most suitable electrical pr
Publicado em: 2006
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3. A two band model for superconductivity: probing interband pair formation
We propose a two band model for superconductivity. It turns out that the simplest nontrivial case considers solely interband scattering, and both bands can be modeled as symmetric (around the Fermi level) and flat, thus each band is completely characterized by its half-band width Wn (n=1,2). A useful dimensionless parameter is d, proportional to W2 - W1. The
Brazilian Journal of Physics. Publicado em: 2003-12
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4. Study of dynamical dipole moment in an asymmetric double quantum well
A study of the dynamical behavior of the charge in an asymmetric double quantum well is presented. In particular, the time behavior of intrasub-band dipole moment which is induced by intersub-band optical excitation is analyzed in two aspects: first, design of the quantum wells in order to spatially separate the charge and store it and second study the dynam
Brazilian Journal of Physics. Publicado em: 2002-06
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5. Modelamento de transistores bipolares de heterojunção
A study about current transport mechanism through a heterojunction is presented. Drift and diffusion mechanism are not enough to describe the electrical current (due to a spike in the conduction band of the Npn transistor). This has led to the introduction of the Thermionic-Emission mechanism. The Ebers-Moll and Gummel-Poon models are also compatible with th
Publicado em: 1995
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6. Experimental test of the vibronically coupled tunneling description of biological electron transfer.
Evidence for the constructs central to vibronically coupled electron transfer has been obtained. Our experiments show the existence of a weak (f congruent to 10(-6)) charge-transfer absorption band in the near infrared for the bound donor-acceptor complex, cytochrome c-Fe(CN)6. Such a charge-transfer band had been predicted from the theory of such transfers.
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7. Fundamental aspects of electron transfer: experimental verification of vibronically coupled electron tunneling.
A detailed investigation of the applicability of the vibronically coupled electron tunneling theory in biomolecules can be made by a quantitative study of a weak charge-transfer optical absorption band that has been predicted by this theory. The measurement of the position, width, and molar extinction coefficient of this band is examined in the bound model s
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8. Tunneling in Chromatium chromatophores: Detection of a Hopfield charge-transfer band
We have observed a weak charge-transfer band in the cytochrome c-P870 electron-transfer reaction in Chromatium vinosum chromatophores at 10 K and at 85 K. First, the intermediate acceptor, I, was trapped in the reduced state by lowering the redox potential at room temperature, then illuminating with white light at low temperature for 20 min. Next, illuminati
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9. Molecular electronics of a single photosystem I reaction center: studies with scanning tunneling microscopy and spectroscopy.
Thylakoids and photosystem I (PSI) reaction centers were imaged by scanning tunneling microscopy. The thylakoids were isolated from spinach chloroplasts, and PSI reaction centers were extracted from thylakoid membranes. Because thylakoids are relatively thick nonconductors, they were sputter-coated with Pd/Au before imaging. PSI photosynthetic centers and ch
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10. Ligand binding to heme proteins: II. Transitions in the heme pocket of myoglobin.
Phenomena occurring in the heme pocket after photolysis of carbonmonoxymyoglobin (MbCO) below about 100 K are investigated using temperature-derivative spectroscopy of the infrared absorption bands of CO. MbCO exists in three conformations (A substrates) that are distinguished by the stretch bands of the bound CO. We establish connections among the A substat