2018
DOI: 10.1103/physrevb.97.195156
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Doping evolution of charge and spin excitations in two-leg Hubbard ladders: Comparing DMRG and FLEX results

Abstract: We study the magnetic and charge dynamical response of a Hubbard model in a two-leg ladder geometry using the density matrix renormalization group (DMRG) method and the random phase approximation within the fluctuation-exchange approximation (RPA+FLEX). Our calculations reveal that RPA+FLEX can capture the main features of the magnetic response from weak up to intermediate Hubbard repulsion for doped ladders, when compared with the numerically exact DMRG results. However, while at weak Hubbard repulsion both t… Show more

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Cited by 19 publications
(19 citation statements)
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“…2a). We can contrast our results with the much studied one-orbital two-leg ladder Hubbard model, where charge excitations are gapped in the half-filled Mott phase but display a gapless continuum in the metallic phase away from half-filling [35]. Our results show the simultaneous presence of localized and itinerant fermions in our multi-orbital model.…”
contrasting
confidence: 79%
“…2a). We can contrast our results with the much studied one-orbital two-leg ladder Hubbard model, where charge excitations are gapped in the half-filled Mott phase but display a gapless continuum in the metallic phase away from half-filling [35]. Our results show the simultaneous presence of localized and itinerant fermions in our multi-orbital model.…”
contrasting
confidence: 79%
“…( 4) and ( 5), which can be found in Ref. 69. Here, we calculated the response functions for N = 20 unit cell long chains and open boundary conditions, which corresponds to total system sizes of N and 4N + 1 orbitals for the single-and multi-orbital cases, respectively.…”
Section: Density Matrix Renormalization Groupmentioning
confidence: 99%
“…By putting U ± eff [Eqs. (13) and (14)] into Eq. (15), we obtain 0) ] corresponds to the high-energy mode of O(U ) [Eqs.…”
Section: B Intermediate-energy Emergent Modementioning
confidence: 99%