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?

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