To simulate the effect of temperature on charges, I need to define a random current source in MEEP. I've found the development version of MEEP has this feature. It is given as a noisy lorentzian susceptibility. The math is described in the reference below.
D. Chan, M. Soljačić, and J. Joannopoulos, “Direct calculation of thermal emission for three-dimensionally periodic photonic crystal slabs,” Physical Review E, vol. 74, no. 3, pp. 1-9, Sep. 2006.
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