Correlation-induced metal insulator transition in a two-channel fermion-boson model

Details Correlation-induced metal insulator transition in a two-channel fermion-boson model Correlation-induced metal insulator transition in a two-channel fermion-boson model

2008-02-07

arxiv.org/abs/0802.0991v2

Phys. Rev. Lett. 101, 116402 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, 1 table, revised version accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.136402

We investigate charge transport within some background medium by means of an effective lattice model with a novel form of fermion-boson coupling. The bosons describe fluctuations of a correlated background. By analyzing groundstate and spectral properties of this transport model, we show how a metal-insulator quantum phase transition can occur for the half-filled band case. We discuss the evolution of a mass-asymmetric band structure in the insulating phase and establish connections to the Mott and Peierls transition scenarios.

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