We study crystal dynamics in the harmonic approximation. The atomic masses are weakly disordered, in the sense that their deviation from uniformity is of the order \(\sqrt{\epsilon}\). The dispersion relation is assumed to be a Morse function and to suppress crossed recollisions. We then prove that in the limit \(\epsilon\to 0\), the disorder-averaged Wigner function on the kinetic scale, time and space of order \(\epsilon^{-1}\), is governed by a linear Boltzmann equation.
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Lukkarinen, J., Spohn, H. Kinetic Limit for Wave Propagation in a Random Medium. Arch Rational Mech Anal 183, 93–162 (2007). https://doi.org/10.1007/s00205-006-0005-9
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DOI: https://doi.org/10.1007/s00205-006-0005-9