Computational design of direct-bandgap semiconductors that lattice-match silicon
Article Abstract:
Research into the integration of silicon electronics and the computational design of two hypothetical direct-bandgap semiconductor alloys is presented.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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Fully collapsed carbon nanotubes
Article Abstract:
Carbon nanotubes suffering complete collapse along their lengths were revealed in a study of the structure of carbon fibers using transmission electron microscopes. A twist was observed in all the collapsed tubes, suggesting it as the probable cause for the collapse. For the given set of conditions, deflated nanotubes were energetically more stable than the inflated tubes. Role of curvature and van der Waals energies in the structure of flattened tubes are discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Broken symmetry and pseudogaps in ropes of carbon nanotubes
Article Abstract:
First-principles calculations can be used to indicate that a broken symmetry of the (10,10) tube created by interactions between tubes in a rope forms a pseudogap of around 0.1 eV at the Fermi level. The pseudogap has a significant impact on many of the basic electronic properties. It was established that the density of states, and therefore properties connected with it, does not depend on the details of the relative orientations of the tubes. The existence of the pseudogap as a result of the broken symmetry in the rope makes the conductivity and other transport properties very different from those of isolated tubes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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