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17 Mar 2003

Volume 82, Issue 11, pp. 1649-1799

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 1709 (2003); http://dx.doi.org/10.1063/1.1560575 (3 pages)

Ji-Won Oh, Masahiro Yoshita, Hidefumi Akiyama, Loren N. Pfeiffer, and Ken W. West
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Morphology and surface reconstructions of GaN(1math00) surfaces

C. D. Lee, R. M. Feenstra, J. E. Northrup, L. Lymperakis, and J. Neugebauer

Appl. Phys. Lett. 82, 1793 (2003); http://dx.doi.org/10.1063/1.1560558 (3 pages) | Cited 20 times

Online Publication Date: 10 March 2003

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GaN is grown by plasma-assisted molecular-beam epitaxy on ZnO(1math00) substrates. Well-oriented (1math00) GaN surfaces are obtained, and (1math01) oriented facets are also observed. On the GaN(1math00) surfaces under Ga-rich conditions, a surface reconstruction with approximate symmetry of 4×5 is found. A model is proposed in which this reconstruction consists of ⩾2 monolayers of Ga terminating the GaN surface. © 2003 American Institute of Physics.
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68.55.A- Nucleation and growth
68.35.B- Structure of clean surfaces (and surface reconstruction)
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
52.77.Dq Plasma-based ion implantation and deposition
68.47.Fg Semiconductor surfaces
81.05.Ea III-V semiconductors
81.15.Jj Ion and electron beam-assisted deposition; ion plating

Experimental investigation for field-induced interaction force of two spheres

Zhiyong Wang, Zheng Peng, Kunquan Lu, and Weijia Wen

Appl. Phys. Lett. 82, 1796 (2003); http://dx.doi.org/10.1063/1.1560556 (3 pages) | Cited 11 times

Online Publication Date: 10 March 2003

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An apparatus is developed to study the interaction forces between two spheres under an external ac electric field. The interaction forces of a pair of spheres as the function of interspherical spacing, electric field strength, and electric field frequency are measured precisely. The results reveal that much stronger interaction can be obtained for metal spheres and high-dielectric spheres compared with the spheres with a very low dielectric constant, such as glass and polymer. The measured forces increase very steeply as the gap of the spheres decreases, and become much larger than those of available theoretical predictions when the two single-crystalline spheres of SrTiO3 are closely spaced. The frequency dependence of the interaction force also shows an anomalous behavior. Our measurements indicate that a more accurate theoretical calculation should be performed to explain the experimental results. © 2003 American Institute of Physics.
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77.65.-j Piezoelectricity and electromechanical effects
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