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Repulsive casimir effect with chern insulators

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journal contribution
posted on 14.02.2014 by Pablo Rodriguez-Lopez, Adolfo G. Grushin
We theoretically predict that the Casimir force in vacuum between two Chern insulator plates can be repulsive (attractive) at long distances whenever the sign of the Chern numbers characterizing the two plates are opposite (equal). A unique feature of this system is that the sign of the force can be tuned simply by turning over one of the plates or alternatively by electrostatic doping.We calculate and take into account the full optical response of the plates and argue that such repulsion is a general phenomena for these systems as it relies on the quantized zero frequency Hall conductivity. We show that achieving repulsion is possible with thin films of Cr-doped ðBi; SbÞ2Te3, that were recently discovered to be Chern insulators with quantized Hall conductivity.

Funding

Support from FIS2011-23713, PIB2010BZ-00512 (A. G. G.) and EPSRC [grant number: EP/H049797/1] and MOSAICO (P. R.-L.) is acknowledged.

History

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  • Science

Department

  • Physics

Citation

RODRIGUEZ-LOPEZ, P. and GRUSHIN, A.G., 2014. Repulsive casimir effect with chern insulators. Physical Review Letters, 112 (056804), 5pp.

Publisher

© American Physical Society

Version

VoR (Version of Record)

Publication date

2014

Notes

This article was published in the journal, Physical Review Letters [© American Physical Society] and the definitive version is also available at: http://dx.doi.org/10.1103/PhysRevLett.112.056804.

ISSN

0031-9007

eISSN

1079-7114

Language

en

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