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21 May 2012

Volume 100, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 100, 213701 (2012); http://dx.doi.org/10.1063/1.3701135 (4 pages)

Wen Lo, Ara Ghazaryan, Chien-Hsin Tso, Po-Sheng Hu, Wei-Liang Chen, Tsung-Rong Kuo, Sung-Jan Lin, Shean-Jen Chen, Chia-Chun Chen, and Chen-Yuan Dong
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Interfacial confinement in core-shell nanowires due to high dielectric mismatch

A. A. Sousa, T. A. S. Pereira, A. Chaves, J. S. de Sousa, and G. A. Farias

Appl. Phys. Lett. 100, 211601 (2012); http://dx.doi.org/10.1063/1.4720402 (4 pages) | Cited 1 time

Online Publication Date: 22 May 2012

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We theoretically investigate the role of the dielectric mismatch between materials on the energy levels and recombination energies of a core-shell nanowire. Our results demonstrate that when the dielectric constant of the core material is lower than that of the shell material, the self-image potential pushes the charge carriers towards the core-shell interface in such a way that the ideal confinement model is no longer suitable. The effects of this interfacial confinement on the electronic properties of such wires, as well as on its response to applied magnetic fields, are discussed.
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73.22.-f Electronic structure of nanoscale materials and related systems
73.20.At Surface states, band structure, electron density of states
77.22.Ch Permittivity (dielectric function)

Contributions of atomic diffusion and plastic deformation to the plasma surface activation assisted diffusion bonding of zirconium-based bulk metallic glass

H. Y. Chen, J. Cao, X. G. Song, and J. C. Feng

Appl. Phys. Lett. 100, 211602 (2012); http://dx.doi.org/10.1063/1.4721665 (4 pages) | Cited 2 times

Online Publication Date: 24 May 2012

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A mathematical model was established to estimate the contributions of atomic diffusion and plastic deformation to the diffusion bonding of zirconium-based bulk metallic glasses. Additionally, the surface state was introduced into the model since oxide film is the main barrier to atomic bonding across interface. The model calculation displayed that the contribution of plastic deformation to void closure was six orders of magnitude higher than atomic diffusion. The joints with ion etching before bonding were achieved to verify the model. The experimental strength of joints had a sound fit with the theoretical strength calculated by the model.
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81.40.Lm Deformation, plasticity, and creep
81.65.Cf Surface cleaning, etching, patterning
62.20.fg Shape-memory effect; yield stress; superelasticity
64.70.pe Metallic glasses
66.30.hh Glasses
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