Dynamical properties of two doped, coupled Hubbard chains
| dc.creator | Noack, R. M. | |
| dc.creator | Zacher, M. G. | |
| dc.creator | Endres, H. | |
| dc.creator | Hanke, W. | |
| dc.date | 1998-08-03 | |
| dc.date.accessioned | 2026-07-07T03:11:13Z | |
| dc.date.available | 2026-07-07T03:11:13Z | |
| dc.description | Using quantum Monte Carlo (QMC) simulations combined with Maximum Entropy analytic continuation as well as analytical methods, we examine the one- and two-particle dynamical properties of the Hubbard model on two coupled chains at small doping. The behavior of the single-particle spectral weight $A({\bf k},ω)$ as a function of hopping anisotropy $t_\perp/t$ at intermediate interaction strength is dominated by the transition from one-band behavior at large $t_\perp/t$ to two-band behavior at small $t_\perp/t$, although interaction effects such as band-narrowing, a shift of spectral weight to higher energies in the unoccupied antibonding band and reflected structures due to short-range antiferromagnetic correlations are also present. A single-particle gap is resolved in the intermediate $t_\perp/t$ Luther-Emery phase using Density Matrix Renormalization Group calculations. The dynamical spin and charge susceptibilities show features of the expected bonding-band Luttinger liquid behavior, as well as higher-energy features due to local excitations between the chains at large $t_\perp/t$, and evolve towards the behavior of two uncoupled chains as $t_\perp/t$ is reduced. For the one hole, large $t_\perp/t$ case, we make a detailed comparison between the QMC data and an approximation based on local rung states. At isotropic coupling and somewhat larger doping, we find that the dispersion of the single-particle bands is essentially unrenormalized from that of the noninteracting system, and that the spin and charge response functions have features also seen in random-phase-approximation calculations. | |
| dc.description | 12 pages, 17 figure captions; a version with embedded figures (1.6 MByte zipped) is available for download at our institute server (http://theorie.physik.uni-wuerzburg.de/publications.shtml, ftp://ftp.physik.uni-wuerzburg.de/pub/preprint/1998/WUE-ITP-98-027.ps.gz); hardcopies of figures or the original files can be obtained upon email request to M.G. Zacher (mailto:gaston@physik.uni-wuerzburg.de) | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9808020 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9808020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/28489 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Dynamical properties of two doped, coupled Hubbard chains | |
| dc.type | text |