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We demonstrate selectively-grown GaAs nano/micro structures on silicon substrates by molecular beam epitaxy. Hexagonal or rectangular shaped GaAs crystals, depending on the orientation of the silicon substrate, were formed inside the silicon-dioxide-masked nanoholes at 630°C. Clear facets, which are the low-energy {011} planes, indicate single-crystalline nature of the growth. GaAs/InAs/GaAs structure...
We report the observation of near-IR emission from Al-AlOx-Au tunnel junctions and a blurred-up peak at high applied voltage. We argue that it results from an interaction with near-IR surface plasmons.
We report lateral quantum coupling between two self-assembled InGaAs/GaAs quantum dots. Single-photon photoluminescence emission has been observed from this quantum dot molecule and the level of coupling can be controlled using a static electric field.
Operation of AlGaN/GaN HFETs in space was simulated by irradiation with protons and heavy ions at 68 MeV and 2MeV and fluences up to 1013 cm-2. Before and after irradiation dc and pulsed I-V characteristics of the AlGaN HFET devices were measured. A thick GaN reference layer was characterized by photoluminescence, X-ray diffraction and Hall measurements before and after irradiation. The results of...
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