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    Tuning Casimir Forces
    Posted on Monday, December 10, 2012 @ 20:33:22 EST by vlad

    Science From Physics: When two uncharged metallic mirrors are placed sufficiently close in a vacuum, fluctuations in the quantum vacuum field create an attractive force between them, known as the Casimir force. But if the mirrors are made of graphene, instead of a metal, something different can happen in the presence of a magnetic field. Writing in Physical Review Letters, Wang-Kong Tse and Allan MacDonald at the University of Texas at Austin investigate a possible method for controlling and even eliminating the Casimir force in this manner.


    The scheme exploits the emergence of discrete Landau energy levels in graphene, arising from the quantum Hall effect induced by a strong magnetic field. The Casimir effect thus becomes dependent on the Hall conductivity, which in turn leads to the quantization of the Casimir force and allows tuning it electrically between repulsive and attractive values....

    More: http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.109.236806

     
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    "Tuning Casimir Forces" | Login/Create an Account | 1 comment | Search Discussion
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    Lab Discovers How to Suppress the Casimir Force (Score: 1)
    by vlad on Tuesday, October 15, 2013 @ 22:25:15 EDT
    (User Info | Send a Message) http://www.zpenergy.com
    Via Keelynet.com: The Casimir effect causes microscopic machines to stick fast. Now physicists have succesfully tested a way to suppress this force The Casimir effect is a strange and mysterious force that operates on the tiniest scales. It pushes together small metal objects when they are separated by a tiny distance...

    More: http://www.keelynet.com/news/101513a.html [www.keelynet.com]



     

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