Measurement of the Casimir force between Germanium plates using a torsion balance

Dalvit, Diego; Kim, W J; Sushkov, A O; Lamoreaux, S K

Title: Measurement of the Casimir force between Germanium plates using a torsion balance

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Abstract

We report the measurement of the Casimir force between Ge plates in a sphere-plane configuration using a torsion balance. We observe that the effective contact potential between the plates varies with their separation distance, resulting in a systematic force. In addition, an unexpected 1/d force is also found in our data that persists even when the electrostatic force between the plates is experimentally minimized by applying a compensating potential. After applying corrections due to these systematic forces, likely of electrostatic origin, our result can be described by the bare permittivity of Ge without conduction, the Drude and the diffusion models for electrical and optical properties of Ge, but not by the plasma model.

Authors:

Dalvit, Diego ^[1]; Kim, W J ^[2]; Sushkov, A O ^[2]; Lamoreaux, S K ^[2]

Los Alamos National Laboratory
YALE UNIV

Publication Date:: Tue Jan 01 00:00:00 EST 2008

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 960868

Report Number(s):: LA-UR-08-07718; LA-UR-08-7718
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US201008%%777

DOE Contract Number:: AC52-06NA25396

Resource Type:: Journal Article

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Name: Physical Review Letters; Journal ID: ISSN 0031-9007

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BALANCES; CASIMIR EFFECT; CONFIGURATION; CORRECTIONS; DIFFUSION; DISTANCE; ELECTROSTATICS; GERMANIUM; OPTICAL PROPERTIES; ORIGIN; PERMITTIVITY; PLASMA; PLATES; POTENTIALS; TORSION

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                    Dalvit, Diego, Kim, W J, Sushkov, A O, and Lamoreaux, S K. Measurement of the Casimir force between Germanium plates using a torsion balance.  United States: N. p., 2008. 
        Web.

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                    Dalvit, Diego, Kim, W J, Sushkov, A O, & Lamoreaux, S K. Measurement of the Casimir force between Germanium plates using a torsion balance.  United States.

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                    Dalvit, Diego, Kim, W J, Sushkov, A O, and Lamoreaux, S K. 2008.  
        "Measurement of the Casimir force between Germanium plates using a torsion balance".  United States.  https://www.osti.gov/servlets/purl/960868.

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@article{osti_960868,

  title        = {Measurement of the Casimir force between Germanium plates using a torsion balance},

  author       = {Dalvit, Diego and Kim, W J and Sushkov, A O and Lamoreaux, S K},

  abstractNote = {We report the measurement of the Casimir force between Ge plates in a sphere-plane configuration using a torsion balance. We observe that the effective contact potential between the plates varies with their separation distance, resulting in a systematic force. In addition, an unexpected 1/d force is also found in our data that persists even when the electrostatic force between the plates is experimentally minimized by applying a compensating potential. After applying corrections due to these systematic forces, likely of electrostatic origin, our result can be described by the bare permittivity of Ge without conduction, the Drude and the diffusion models for electrical and optical properties of Ge, but not by the plasma model.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/960868},
  journal      = {Physical Review Letters},

  issn         = {0031-9007},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 2008},

  month        = {Tue Jan 01 00:00:00 EST 2008}

}

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