Doublon-holon origin of the subpeaks at the Hubbard band edges

Autor:	Lee, Seung-Sup B., von Delft, Jan, Weichselbaum, Andreas
Rok vydání:	2017
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 119, 236402 (2017)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.119.236402
Popis:	Dynamical mean-field theory (DMFT) studies frequently observe a fine structure in the local spectral function of the SU(2) Fermi-Hubbard model at half filling: In the metallic phase close to the Mott transition, subpeaks emerge at the inner edges of the Hubbard bands. Here we demonstrate that these subpeaks originate from the low-energy effective interaction of doublon-holon pairs, by investigating how the correlation functions of doublon and holon operators contribute to the subpeaks. A mean-field analysis of the low-energy effective Hamiltonian provides results consistent with our DMFT calculation using the numerical renormalization group as an impurity solver. In the SU(3) and SU(4) Hubbard models, the subpeaks become more pronounced due to the increased degeneracy of doublon-holon pair excitations. Comment: Published version. For the detail of analytical part, refer to arXiv:1710.01171
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1705.03910 Zobrazit plný text záznamu View this record from Arxiv