Direct perturbation theory on the shift of Electron Spin Resonance
Yoshitaka Maeda, Masaki Oshikawa
Abstract
We formulate a direct and systematic perturbation theory on the shift of the main paramagnetic peak in Electron Spin Resonance, and derive a general expression up to second order. It is applied to one-dimensional XXZ and transverse Ising models in the high field limit, to obtain explicit results including the polarization dependence for arbitrary temperature.
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