998 resultados para Electrons--Distribució
Resumo:
Ponent: Anna Ortiz / Presenta: Bárbara Biglia
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Ponent: Anna Ortiz / Presenta: Bárbara Biglia
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Ponent: Anna Ortiz / Presenta: Bárbara Biglia
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Ponent: Anna Ortiz / Presenta: Bárbara Bligia
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Ponent: Nirmal Puwar / Presenta: Alessandra Caporale
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Ponent: Marta Luxan / Presenta: Ruth Vilà
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Ponent: Marta Luxan / Presenta: Ruth Vilà
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Ponent: Marta Luxan / Presenta: Ruth Vilà
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Ponent: Marta Luxan / Presenta: Ruth Vilà
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Ponent: Marta Luxan / Presenta: Ruth Vilà
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Ponent: Erica Burman / Presenta: Jordi Bonet
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Ponent: Erica Burman / Presenta: Jordi Bonet
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Ponent: Erica Burman / Presenta: Jordi Bonet
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Within current-density-functional theory, we have studied a quantum dot made of 210 electrons confined in a disk geometry. The ground state of this large dot exhibits some features as a function of the magnetic field (Beta) that can be attributed in a clear way to the formation of compressible and incompressible states of the system. The orbital and spin angular momenta, the total energy, ionization and electron chemical potentials of the ground state, as well as the frequencies of far-infrared edge modes are calculated as a function of Beta, and compared with available experimental and theoretical results.
Resumo:
Measurements of the entropy change at the martensitic transition of two composition-related sets of Cu-Al-Mn shape-memory alloys are reported. It is found that most of the entropy change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase. Using data from the literature for other Cu-based alloys, this result is shown to be general. In addition, it is shown that the martensitic structure changes from 18R to 2H when the ratio of conduction electrons per atom reaches the same value as the eutectoid point in the equilibrium phase diagram. This finding indicates that the structure of the metastable low-temperature phase is reminiscent of the equilibrium structure.