Effects of spatial dispersion on the Casimir force between graphene sheets

D. Drosdoff, A. Phan, L. Woods (), I. Bondarev and J. Dobson

The European Physical Journal B: Condensed Matter and Complex Systems, 2012, vol. 85, issue 11, 1-6

Abstract: The asymptotic dispersion force F between two graphene sheets at a separation d is unusual: at T=0 K, F ∼ C d −p , where p=4, unlike the 2D insulating (p=5) or metallic (p=7/2) cases. Here it is shown that these anomalous low-temperature properties of p are retained even when spatial dispersion (nonlocality) is included in the optical response properties of graphene. Furthermore, it is shown that the prefactor C is only weakly decreased (by >20%) upon spatial dispersion inclusion. For larger temperatures and nonzero chemical potential, such dispersion has even a lesser effect on the graphene/graphene force. The opening of a band gap in the graphene electronic structure, however, can cause larger sensitivity to spatial dispersion at elevated temperatures. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Keywords: Mesoscopic and Nanoscale Systems (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1140/epjb/e2012-30741-6

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