Local e horário: S-307-2, SA, 14:00

Palestrante: Nail Khusnutdinov (UFABC and Kazan Federal University, Russia)

Título: The Casimir and Casimir-Polder effects for layered system of graphenes

Resumo:

In framework of zeta-regularization approach we obtained in manifest

form the Casimir energy of stack of N conductive planes (graphenes)
and the Casimir-Polder/van der Waals interaction a microparticle with
the stack. The general expressions for energy crucially depend on the
model of conductivity of graphene. We considered two different models
of conductivity the constant conductivity model and the Drude-Lorentz
model with a finite set of oscillators consistent with the optical
characteristics for graphite. It is found that the asymptotic distance
dependence is affected significantly by the specific response. While
the energy falls down as cube of inverse distance for the constant
conductivity model, the energy exhibits fractional dependence 5/2 for
the Drude-Lorentz description. The Casimir force on a plane is also
strongly dependent upon the particular plane location in the stack.
Furthermore, the calculated Casimir energy within the Drude-Lorentz
model yields results in good agreement with measured cohesion energy
in graphite. We investigated also the Casimir-Polder force for
Hydrogen atom in vicinity of this stack of graphite planes. Both
considered problems are very important for graphens physics and
technology.