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Journal Article

Field-induced polaron formation in the Holstein-Hubbard model


Eckstein,  Martin
CFEL - Hamburg, Germany ;
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Werner, P., & Eckstein, M. (2015). Field-induced polaron formation in the Holstein-Hubbard model. EPL, 109(3): 37002. doi:10.1209/0295-5075/109/37002.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-16B2-B
We study the effect of strong DC and pulsed electric fields on a Mott insulating system with coupling to optical phonons. A DC field of the order of the gap induces a metallic state characterized by polaronic features in the gap region and a partially inverted population. In this quasi-steady state, the field-induced doublon-hole production is balanced by a phonon-enhanced doublon-hole recombination. The photo-excitation of carriers by a pulsed field leads to similar modifications of the electronic structure in the gap region, and an associated reduction of the doublon life-time. We demonstrate that the field-induced localization of electrons effectively enhances the phonon coupling, an effect which should be measureable with time-resolved photo-emission spectroscopy.