Field-induced polaron formation in the Holstein-Hubbard model

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,...

Full description

Saved in:
Bibliographic Details
Published inEurophysics letters Vol. 109; no. 3; pp. 37002 - p1-37002-p6
Main Authors Werner, Philipp, Eckstein, Martin
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.02.2015
IOP Publishing
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary: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.
Bibliography:publisher-ID:epl16871
istex:32F4CCB31A7109D0C3E37F27FC984FBA481FDF25
ark:/67375/80W-S5GRMB9B-G
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/109/37002