Coherent acoustic phonons in strain engineered InAs∕GaAs quantum dot clusters

Recent experiments on nanoscale materials, including nanowires, nanopillars, nanoparticles, nanolayers, and nanocrystals, have revealed a host of "ultra-strength" phenomena, defined by stresses in the material generally rising up to a significant fraction of the ideal strength-the highest achievable strength of a defect-free crystal. This article presents an overview of the strength-controlling deformation mechanisms and related mechanics models in ultra-strength nanoscale materials. The critical role of the activation volume is highlighted in understanding the deformation mechanisms, as well as the size, temperature, and strain rate dependence of ultra strength.

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Ultra-strength materials

Zhu

2010

Progress in Materials Science

741

471

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Plasmon excitations in scanning tunneling microscopy: Simultaneous imaging of modes with different localizations coupled at the tip

Romero

Lagemaat

Rumbles

et al. 2007

Applied Physics Letters

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The authors investigate the localization of photons emitted at the tip during scanning tunneling microscopy measurements on atomically flat gold substrates. Emission patterns of the plasmon-mediated luminescence exhibit distinct features that are assigned to the localized modes of the surface plasmon ͑LSP͒ confined to the tunneling gap and propagating modes ͑PSP͒ coupled to the LSP by the optical cavity beneath the tip. Tunneling luminescence spectroscopy reveals that the plasmon localization at the tip increases when modes of higher energy are excited. Acquisition of local emission patterns allows us for the simultaneous imaging of LSP and PSP modes.

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Decoupling of optical generation and detection of acoustic phonons in semiconductor superlattices

Winter

Fainstein

Jusserand

et al. 2007

J. Phys.: Conf. Ser.

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Coherent acoustic phonons in strain engineered InAs∕GaAs quantum dot clusters

Cited by 4 publications

References 25 publications

Ultra-strength materials

Ultra-strength materials

Plasmon excitations in scanning tunneling microscopy: Simultaneous imaging of modes with different localizations coupled at the tip

Decoupling of optical generation and detection of acoustic phonons in semiconductor superlattices

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