Exact response functions within the time-dependent Gutzwiller approach

Autor:	Bünemann, J., Wasner, S., Oelsen, E. v., Seibold, G.
Rok vydání:	2014
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1080/14786435.2014.964348
Popis:	We investigate the applicability of the two existing versions of a time-dependent Gutzwiller approximation (TDGA) beyond the frequently used limit of infinite spatial dimensions. To this end, we study the two-particle response functions of a two-site Hubbard model where we can compare the exact results and those derived from the TDGA. It turns out that only the more recently introduced version of the TDGA can be combined with a diagrammatic approach which allows for the evaluation of Gutzwiller wave functions in finite dimensions. For this TDGA method we derive the time-dependent Lagrangian for general single-band Hubbard models. Comment: 13 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1401.5624 Zobrazit plný text záznamu View this record from Arxiv