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kulbir

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I am trying to find dispersion relation of amorphous material (using data obtained by molecular dynamics simulation). As it is not periodic system one can not find it by standard method of diagonalizing the force constant matrix. I think one can do it by taking Fourier transform of displacements (like we do to find density of states, DOS, by taking Fourier transform of velocity auto correlation function, VACF). Is it correct ? If yes then how? what is the physical meaning ? and what is the exact relation?

Thanks.