948 resultados para SEMICONDUCTOR MICROLASERS
Resumo:
"December 6, 1960."
Resumo:
Included are 464 selected references on the theory, manufacture, properties, performance, and utliization of semiconductor materials for the detection of nuclear radiation. Reports and open literature references are covered through January 1962.
Resumo:
"Work Performed Under Contract No. AC02-77CH00178."
Resumo:
"October 21, 1963"
Resumo:
Mode of access: Internet.
Resumo:
"August 1973."
Resumo:
Mode of access: Internet.
Resumo:
Mode of access: Internet.
Resumo:
Mode of access: Internet.
Resumo:
Mode of access: Internet.
Resumo:
"This activity was supported by the Defense Advanced Research Projects Agency and the National Bureau of Standards."
Resumo:
Includes bibliography.
Resumo:
Title varies slightly.
Resumo:
"February 1991."
Resumo:
Within the ballistic transport picture, we have investigated the spin-polarized transport properties of a ferromagnetic metal/two-dimensional semiconductor (FM/SM) hybrid junction and an FM/FM/SM structure using quantum tunnelling theory. Our calculations indicate explicitly that the low spin injection efficiency (SIE) from an FM into an SM, compared with a ferromagnet/normal metal junction, originates from the mismatch of electron densities in the FM and SM. To enhance the SIE from an FM into an SM, we introduce another FM film between them to form FM/FM/SM double tunnel junctions, in which the quantum interference effect will lead to the current polarization exhibiting periodically oscillating behaviour, with a variation according to the thickness of the middle FM film and/or its exchange energy strength. Our results show that, for some suitable values of these parameters, the SIE can reach a very high level, which can also be affected by the electron density in the SM electrode.