Optical conductivity of the Frohlich polaron

Details Optical conductivity of the Frohlich polaron Optical conductivity of the Frohlich polaron

2003-12-04

arxiv.org/abs/cond-mat/0312111v1

Phys. Rev. Lett., vol. 91, 236401 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 ps-figures

Scientific paper

10.1103/PhysRevLett.91.236401

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.

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