Potsdam University Potsdam Quantum Optics Group

Universität Potsdam
Institut für Physik
Karl-Liebknecht-Str. 24/25
14476 Potsdam-Golm
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 Publications
 2010
   bimonte09c
 
G. Bimonte, H. Haakh, C. Henkel, and F. Intravaia
Optical BCS conductivity at imaginary frequencies and dispersion energies of superconductors
J. Phys. A 43 (2010) 145304

Abstract

    We present an efficient expression for the analytic continuation to arbitrary complex frequencies of the complex optical and AC conductivity of a homogeneous superconductor with arbitrary mean free path. Knowledge of this quantity is fundamental in the calculation of thermodynamic potentials and dispersion energies involving type-I superconducting bodies. When considered for imaginary frequencies, our formula evaluates faster than previous schemes involving Kramers-Kronig transforms. A number of applications illustrates its efficiency: a simplified low-frequency expansion of the conductivity, the electromagnetic bulk self-energy due to longitudinal plasma oscillations, and the Casimir free energy of a superconducting cavity.

[ 0907.3775 ] [ DOI ]

file generated: 3 Mar 2014


   
   
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