Journal
EPL
Volume 84, Issue 5, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1209/0295-5075/84/57001
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Funding
- DFG [SFB 652]
- KONWIHR Bavaria project HQS@HPC
- LRZ Munich
- HLRN Berlin
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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. Copyright (C) EPLA, 2008
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