Casimir pressure in peptide films on metallic substrates: Change of sign
via graphene coating
- URL: http://arxiv.org/abs/2106.06323v1
- Date: Fri, 11 Jun 2021 11:42:18 GMT
- Title: Casimir pressure in peptide films on metallic substrates: Change of sign
via graphene coating
- Authors: G. L. Klimchitskaya, V. M. Mostepanenko and V. N. Velichko
- Abstract summary: We find that the Casimir pressure in peptide films deposited on metallic substrates is always repulsive which makes these films less stable.
It is shown that by adding a graphene sheet on top of peptide film one can change the sign of the Casimir pressure by making it attractive.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We find that the Casimir pressure in peptide films deposited on metallic
substrates is always repulsive which makes these films less stable. It is shown
that by adding a graphene sheet on top of peptide film one can change the sign
of the Casimir pressure by making it attractive. For this purpose, the
formalism of the Lifshitz theory is extended to the case when the film and
substrate materials are described by the frequency-dependent dielectric
permittivities, whereas the response of graphene to the electromagnetic field
is governed by the polarization tensor in (2+1)-dimensional space-time found in
the framework of the Dirac model. Both pristine and gapped and doped graphene
sheets are considered possessing some nonzero energy gap and chemical
potential. According to our results, in all cases the presence of graphene
sheet makes the Casimir pressure in peptide film deposited on a metallic
substrate attractive starting from some minimum film thickness. The value of
this minimum thickness becomes smaller with increasing chemical potential and
larger with increasing energy gap and the fraction of water in peptide film.
The physical explanation for these results is provided, and their possible
applications in organic electronics are discussed.
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