Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-05
Phys. Rev. Lett. 102, 106404 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
revised version (including new data) accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.102.106404
We solve a very general two-channel fermion-boson model describing charge transport within some background medium by means of a refined pseudo-site density matrix renormalization group (DMRG) technique. Performing a careful finite-size scaling analysis, we determine the ground-state phase diagram and convincingly prove that the model exhibits a metal-insulator quantum phase transition for the half-filled band case. In order to characterize the metallic and insulating regimes we calculate besides the local particle densities and fermion-boson correlation functions, the kinetic energy, the charge structure factor, the Luttinger liquid charge exponent and the single-particle excitation gap for a one-dimensional infinite system.
Ejima Satoshi
Fehske Holger
Hager Georg
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