Metallicity in the half-filled Holstein-Hubbard model. Fehske, H., Hager, G., & Jeckelmann, E. EPL (Europhysics Letters), 2008.
Metallicity in the half-filled Holstein-Hubbard model [link]Paper  doi  abstract   bibtex   
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.
@article{fehske_metallicity_2008,
	title = {Metallicity in the half-filled {Holstein}-{Hubbard} model},
	url = {http://dx.doi.org/10.1209/0295-5075/84/57001},
	doi = {10.1209/0295-5075/84/57001},
	abstract = {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.},
	journal = {EPL (Europhysics Letters)},
	author = {Fehske, H. and Hager, G. and Jeckelmann, E.},
	year = {2008},
	keywords = {luttinger},
	pages = {57001+}
}
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