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Demonstration of an Unusual Thermal Effect in the Casimir Force from Graphene

M. Liu1, Y. Zhang1, G. L. Klimchitskaya2,3, V. M. Mostepanenko2,3,4, and U. Mohideen1,*

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
  • 2Central Astronomical Observatory at Pulkovo of the Russian Academy of Sciences, Saint Petersburg, 196140, Russia
  • 3Institute of Physics, Nanotechnology and Telecommunications, Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg 195251, Russia
  • 4Kazan Federal University, Kazan 420008, Russia

  • *Umar.Mohideen@ucr.edu
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Phys. Rev. Lett. 126, 206802 – Published 20 May, 2021

DOI: https://doi.org/10.1103/PhysRevLett.126.206802

Abstract

We report precision measurements of the gradient of the Casimir force between an Au-coated sphere and graphene sheet deposited on a silica plate. The measurement data are compared with exact theory using the polarization tensor found in the framework of the Dirac model including effects of the nonzero chemical potential and energy gap of the graphene sample with no fitting parameters. The very good agreement between experiment and theory demonstrates the unusually big thermal effect at separations below 1  μm which has never been observed for conventional 3D materials. Thus, it is confirmed experimentally that for graphene the effective temperature is determined by the Fermi velocity rather than by the speed of light.

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Phys. Rev. Lett. 126, 206802– Published 20 May, 2021
  • Received 15 December 2020
  • Accepted 27 April 2021
Article part of CHORUS
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