6 research outputs found
Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes
Full text linkWe report the changes in dispersion relations of hypersonic acoustic phonons
in free-standing silicon membranes as thin as \sim 8 nm. We observe a reduction
of the phase and group velocities of the fundamental flexural mode by more than
one order of magnitude compared to bulk values. The modification of the
dispersion relation in nanostructures has important consequences for noise
control in nano and micro-electromechanical systems (MEMS/NEMS) as well as
opto-mechanical devices.Comment: 5 page
Negative refraction of elastic waves at the deep-subwavelength scale in a single-phase metamaterial
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