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Nanomechanical Detection of Vortices in an Electron Fluid

Andrey A. Shevyrin1,*, Askhat K. Bakarov1, and Arthur G. Pogosov1,2

  • *Contact author: shevandrey@isp.nsc.ru
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Phys. Rev. Lett. 137, 116302 – Published 10 September, 2026

DOI: https://doi.org/10.1103/9s99-119b

Abstract

Electron vortices are an expected manifestation of viscosity, yet their detection remains challenging. We introduce a nanomechanical paradigm: a vortex in a suspended resonator generates a magnetic moment that, in an in-plane field, drives vibrations via magnetic torque. Using a comparative design with a reference device where vortices are suppressed, we provide unambiguous identification of the circulating flow. We detect ballistic and hydrodynamic vortices and trace their temperature crossover. Our work establishes nanomechanics as a direct force-sensing platform for electron hydrodynamics.

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Phys. Rev. Lett. 137, 116302– Published 10 September, 2026
  • Received 30 April 2026
  • Accepted 27 July 2026
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