Volume 84, Number 5, December 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 November 2008|
Metallicity in the half-filled Holstein-Hubbard model
Institute for Physics, Ernst-Moritz-Arndt University Greifswald - D-17487 Greifswald, Germany, EU
2 Computing Center, Friedrich-Alexander University Erlangen-Nürnberg - D-91058 Erlangen, Germany, EU
3 Institute for Theoretical Physics, Leibniz University Hannover - D-30167 Hannover, Germany, EU
Corresponding author: email@example.com
Accepted: 21 October 2008
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.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.38.-k – Polarons and electron-phonon interactions
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.