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Synthetic gauge fields for phonon transport in a nano-optomechanical system

Nature Nanotechnology volume 15, pages 198–202 (2020)Cite this article

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Abstract

Gauge fields in condensed matter physics give rise to nonreciprocal and topological transport phenomena and exotic electronic states1. Nanomechanical systems are applied as sensors and in signal processing, and feature strong nonlinearities. Gauge potentials acting on such systems could induce quantum Hall physics for phonons at the nanoscale. Here, we demonstrate a magnetic gauge field for nanomechanical vibrations in a scalable, on-chip optomechanical system. We induce the gauge field through multi-mode optomechanical interactions, which have been proposed as a resource for the necessary breaking of time-reversal symmetry2,3,4. In a dynamically modulated nanophotonic system, we observe how radiation pressure forces mediate phonon transport between resonators of different frequencies. The resulting controllable interaction, which is characterized by a high rate and nonreciprocal phase, mimics the Aharonov–Bohm effect5. We show that the introduced scheme does not require high-quality cavities, such that it allows exploring topological acoustic phases in many-mode systems resilient to realistic disorder.

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Fig. 1: Optomechanical system for synthetic nanomechanical gauge fields.
Fig. 2: Optically mediated phonon conversion.
Fig. 3: Nonreciprocal phase imprint.
Fig. 4: Extended optomechanical nanobeam lattice.

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Data availability

The data that support the plots within this paper and other findings of this study are available from the open-access repository Zenodo, with assigned digital object identifier (DOI) 10.5281/zenodo.3554024.

Code availability

The computer codes that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.

Change history

  • 07 April 2022

    In the version of this article initially published, a conversion error led to “>” symbols appearing as “gt”, once in the paragraph above Eq. (2a) and twice in the paragraph below Eq. (3). The errors have been corrected in the HTML and PDF versions of the article.

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Acknowledgements

This work is part of the research programme of the Netherlands Organisation for Scientific Research (NWO). The authors acknowledge support from the Office of Naval Research (grant no. N00014-16-1-2466), the European Research Council (ERC starting grant no. 759644-TOPP) and the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 732894 (FET Proactive HOT).

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Author notes

  1. These authors contributed equally: John P. Mathew, Javier del Pino.

Authors and Affiliations

  1. Center for Nanophotonics, AMOLF, Amsterdam, The Netherlands

    John P. Mathew, Javier del Pino & Ewold Verhagen

Authors
  1. John P. Mathew
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  3. Ewold Verhagen
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Contributions

J.P.M. performed the experiments and analysed the data. J.d.P. developed the theoretical model. E.V. supervised the project. All authors contributed to the interpretation of results and writing of the manuscript.

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Correspondence to Ewold Verhagen.

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Extended data

Extended Data Fig. 1 Detuning dependent phonon transfer.

a,b,c, Mode transfer measurements for a detuning of \(\Delta /k\ \simeq\) 0.25, 0.01, and \(-0.23\) respectively. The left two panels show the driven response of mode 1 and simultaneously measured transferred response to mode 2 for a fixed \({\omega }_{{\rm{m}}}\) chosen at each detuning. The phase imprint on mode 2 as a function of the modulation phase is shown in the rightmost panels. There is no clear phase pickup for near-zero detuning of the drive laser. The dashed line in the transferred response corresponds to the average magnitude of the transfer signal measured during the phase transfer measurement.

Extended Data Fig. 2 Robust phononic edge states.

a, Optical spring shift measured at higher optical powers for a separate device shows large tunability of the mechanical modes. The dashed, white line shows the drive laser detuning used in b. The unusual features between 193.0 and 193.2 THz are due to a dynamically unstable regime of potential photothermoelastic origin. b, The modulated coupling strength, geff, is higher for higher optical powers. The largest modulated coupling strength measured in our experiments is marked by the dashed line and seen to be \(\sim 2\pi \times 200\) kHz. Here the detection laser was absent and the drive laser response was directly demodulated using the lock-in amplifier leading to a Fano shaped feature for the driven response. c,d,e, (top panels) Band structure for a ribbon geometry (width \(L=20\)) for increasing values of the direct mechanical coupling from left to right (0, 10, and 20 kHz, respectively), displaying the driving modulation frequency. The steady-state phononic amplitude in the absence of disorder is displayed in the middle row, while the result with a phononic frequency disorder with standard deviation \({\sigma }_{\Omega }/2\pi\) = 20 kHz (averaged over 100 realizations) is shown at the bottom. For these plots, \(p/q=1/3\).

Supplementary information

Supplementary Information

Supplementary equations, Figs. 1–4 and refs. 1–16.

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Mathew, J.P., Pino, J.d. & Verhagen, E. Synthetic gauge fields for phonon transport in a nano-optomechanical system. Nat. Nanotechnol. 15, 198–202 (2020). https://doi.org/10.1038/s41565-019-0630-8

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