Spectral microscopic mechanisms and quantum phase transitions in a 1D correlated problem

Details Spectral microscopic mechanisms and quantum phase transitions in a 1D correlated problem Spectral microscopic mechanisms and quantum phase transitions in a 1D correlated problem

2005-08-09

arxiv.org/abs/cond-mat/0508209v2

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 2 figures

Scientific paper

10.1088/0953-8984/18/10/011

In this paper we study the dominant microscopic processes that generate nearly the whole one-electron removal and addition spectral weight of the one-dimensional Hubbard model for all values of the on-site repulsion $U$. We find that for the doped Mott-Hubbard insulator there is a competition between the microscopic processes that generate the one-electron upper-Hubbard band spectral-weight distributions of the Mott-Hubbard insulating phase and finite-doping-concentration metallic phase, respectively. The spectral-weight distributions generated by the non-perturbative processes studied here are shown elsewhere to agree quantitatively for the whole momentum and energy bandwidth with the peak dispersions observed by angle-resolved photoelectron spectroscopy in quasi-one-dimensional compounds.

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