Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-12
EPL 84, 57001 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 7 figures, revised (extended) version, accepted for publication in EPL
Scientific paper
10.1209/0295-5075/84/57001
We re-examine the Peierls insulator to Mott insulator transition scenario in the one-dimensional Holstein-Hubbard model where, at half-filling, electron-phonon and electron-electron interactions compete for establishing charge- and spin-density-wave states, respectively. By means of large-scale density-matrix renormalization group calculations we determine the spin, single-particle and two-particle excitation gaps and prove--in the course of a careful finite-size scaling analysis--recent claims for an intervening metallic phase in the weak-coupling regime. We show that for large phonon frequencies the metallic region is even more extended than previously expected, and subdivided into ordinary Luttinger liquid and bipolaronic liquid phases.
Fehske Holger
Hager Georg
Jeckelmann J.
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