Optical conductivity of the Frohlich polaron
Abstract
We present accurate results for optical conductivity of the three dimensional Frohlich polaron in all coupling regimes. The systematic-error free diagrammatic quantum Monte Carlo method is employed where the Feynman graphs for the momentum-momentum correlation function in imaginary time are summed up. The real-frequency optical conductivity is obtained by the analytic continuation with stochastic optimization. We compare numerical data with available perturbative and non-perturbative approaches to the optical conductivity and show that the picture of sharp resonances due to relaxed excited states in the strong coupling regime is ``washed out''by large broadening of these states. As a result, the spectrum contains only a single-maximum broad peak with peculiar shape and a shoulder.
Keywords
Cite
@article{arxiv.cond-mat/0312111,
title = {Optical conductivity of the Frohlich polaron},
author = {A. S. Mishchenko and N. Nagaosa and N. V. Prokof'ev and A. Sakamoto and B. V. Svistunov},
journal= {arXiv preprint arXiv:cond-mat/0312111},
year = {2009}
}
Comments
4 pages, 6 ps-figures