I have frequency dependent complex conductivity data of a strongly correlated material. Since, scattering rate and effective mass of the charge carriers are frequency dependent in correlated system, I want to analyse the data with extended Drude model. But, in my case imaginary conductivity is negative, so is extended Drude model still possible because then effective mass of the charge carriers will be negative? Is negative effective mass of the charge carrier possible in strongly correlated system?
Dear Gullo,
the effective mass is correlated to the second derivative of the energy band E(k) to the wave vector k. It depends on the curvuature of the band whether the mass is positive or negative. Charges with negative sign are named holes. The sign of a band can change with k and the charactere of a charged particle within the solid depends on energy.
With Regard
R. Mitdank
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