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Volume 15 Issue 3, March 2020

Volume 15 Issue 3

When a magnetic field exerts a force on a moving electron it creates direction-dependent phases; hence, it breaks time-reversal symmetry. A nonreciprocal flow of sound is much harder to achieve and requires artificial gauge potentials that give rise to a magnetic field for sound. Mathew, del Pino and Verhagen now implement such a gauge field for vibrations in an on-chip optomechanical system. They use dynamic modulation of strong laser light to induce multi-mode interactions between two nanoscale resonators of different resonance frequencies. The laser light’s radiation pressure force mediates phonon transport between the resonators, but with a phase difference depending on the direction of the phonon transfer. These experiments establish a synthetic gauge field for nanomechanical transport, such that vibrations feel an effective magnetic field. The cover art displays one of the vibrating nanomechanical resonators under strong laser light illumination.

Letter by Verhagen

Image: Ella Maru Studio and Javier del Pino. Cover Design: Bethany Vukomanovic


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    The addition of carbon nanotubes to the SIN (‘Substitute It Now’) list has evoked reactions from nanomedicine and nanotoxicology researchers, who ask for a fairer and more recent research-based risk assessment of carbon nanotubes.


News & Views

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Review Articles



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