[Todos] RECORDATORIO SEMINARIO IFLP/DEPARTAMENTO DE FÍSICA - MARTES 14 - 11hs.

[Maria Virginia Manias]

*SEMINARIOS  DEL IFLP y DEL DEPARTAMENTO*

*MARTES 14 de FEBRERO – 11 hs*

*AULA CHICA*



*TÍTULO*: "RELATIVISTIC ELECTRON GAS: A NATURAL METAMATERIAL"



*EXPOSITOR:* C. A. A. de Carvalho

*Instituto de Física, Universidade Federal do Rio de Janeiro - UFRJ, Rio de
Janeiro-RJ, Brazil*

*Centro Brasileiro de Pesquisas Físicas – CBPF, Rio de Janeiro-RJ, Brazil*

e-mail: aragao en if.ufrj.br; aragao en cbpf.br


*Resumen:* The electric permittivities and magnetic permeabilities for a
relativistic electron gas are calculated fromquantum electrodynamics at
finite temperature and density as functions of temperature, chemical
potential, frequency, and wave vector. The polarization and the
magnetization depend linearly on both electric and magnetic fields, and are
the sum of a zero-temperature and zero-density vacuum part with a
temperature and chemical-potential-dependent medium part [1]. In the
nonrelativistic limit, results reproduce the Lindhard formula. In the
relativistic case, results unambiguously indicate that the relativistic
electron gas is one of nature’s candidates for the realization of a
negative index of refraction system. Maxwell’s equations in the medium
yield the dispersion relation and the index ofrefraction of the electron
gas. Moreover, a discussion is presented of applications to
condensed-matter systems leading to good agreement with experimental
measurements of the plasmon energy in graphite and tin oxide, as functions
of both the temperature and wave vector [2]. We also derive expressions for
the real and imaginary parts of the EM responses, and relate them to decays
[3] into pairs (electron-hole or electron-positron).Present results should
be relevant for plasma physics, astrophysical observations, synchrotrons,
and other environments with fast-moving electrons.Furthermore, the present
electromagnetic response of a relativistic Fermi gas at finitetemperatures
could be of potential interest in future plasmonic and photonic
investigations.
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