We construct a new numerical method of calculating the linear response in the Kubo formula for huge-Hamiltonian quantum systems. With the help of this method, the temperature dependence of the ESR intensity of the nanomagnet V15 is obtained. The calculated intensity show good agreement with the experimental data by Ajiro et al. [Physica B 329–333, 1138 (2003)]. Our numerical method consists of two techniques: a random vector technique and the Chebyshev-polynomial expansion of exponential operators.
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Machida, M., Iitaka, T., Miyashita, S. (2009). Simulational Study on the Linear Response for Huge Hamiltonians: Temperature Dependence of the ESR of a Nanomagnet. In: Landau, D.P., Lewis, S.P., Schöttler, H.B. (eds) Computer Simulation Studies in Condensed-Matter Physics XIX. Springer Proceedings in Physics, vol 123. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85625-2_16
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