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Engineering nanoscale hypersonic phonon transport.

O Florez^1,2, G Arregui³, M Albrechtsen⁴

¹Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Barcelona, Spain. omar.florez@icn2.cat.

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|August 8, 2022

Summary

This summary is machine-generated.

Researchers eliminated thermal vibrations in a silicon membrane at room temperature, creating a phononic stop band. This breakthrough enables precise phonon manipulation for quantum technologies and signal processing.

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Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Area of Science:

Solid-state physics
Nanotechnology
Acoustics

Background:

Controlling vibrations in solids is key for tuning elastic properties and light interactions.
Thermal vibrations cause noise and dephasing in quantum processes.
Phononic stop bands eliminate specific elastic wave frequencies, suppressing vibrations.

Purpose of the Study:

To demonstrate the complete absence of thermal vibrations in a nanostructured silicon membrane.
To create and characterize a broad phononic bandgap at room temperature.
To explore the potential of this platform for phonon manipulation.

Main Methods:

Fabrication of a nanostructured silicon membrane with a shamrock crystal geometry.
Utilizing Brillouin light scattering spectroscopy to measure guided phonon modes.
Creating a line-defect waveguide to guide elastic waves.

Main Results:

Complete absence of thermal vibrations observed in the silicon membrane at room temperature.
A 5.3-GHz-wide phononic bandgap was achieved, centered at 8.4 GHz.
Gigahertz guided modes were directly measured in the waveguide without external excitation.

Conclusions:

The shamrock crystal geometry provides an effective platform for phonon control.
This research opens possibilities for applications in optomechanics and signal processing transduction.
Demonstrated absence of thermal vibrations advances solid-state quantum device development.