Pseudogaps in the 2D Hubbard Model

Huscroft, Carey; Jarrell, Mark; Maier, Thomas; Moukouri, S.; Tahvildar-Zadeh, A. N.

doi:10.1103/physrevlett.86.139

Cited by 128 publications

(134 citation statements)

References 22 publications

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“…A plausible explanation for the appearance of the pseudo gap in the hole-doped materials is the Mott insulating state, or the Mottness, of their mother compounds. 13) The above mentioned electron-hole asymmetry of the cuprates is summarized in the phase diagram shown in * mizuno@presto.phys.sci.osaka-u.ac.jp Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

2017

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Recent experiments revealed a striking asymmetry in the phase diagram of the high temperature cuprate superconductors. The correlation effect seems strong in the hole-doped systems and weak in the electrondoped systems. On the other hand, a recent theoretical study shows that the interaction strengths (the Hubbard U ) are comparable in these systems. Therefore, it is difficult to explain this asymmetry by their interaction strengths. Given this background, we analyze the one-particle spectrum of a single band model of a cuprate superconductor near the Fermi level using the dynamical mean field theory. We find the difference in the "visibility" of the strong correlation effect between the hole-and electron-doped systems. This can explain the electron-hole asymmetry of the correlation strength without introducing the difference in the interaction strength.

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Section: Introductionmentioning

confidence: 99%

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

2017

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“…The Hubbard gap between these bands increases with larger U . Both dynamical cluster approximation [23][24][25] and cellular dynamical mean field theory 67 studies suggest that this gap is preserved for any finite value of the on-site interaction at sufficiently low temperatures even in the thermodynamic limit, with U = 0t being the only singular point.…”

Section: Spectral Functions and Density Of Statesmentioning

confidence: 99%

“…10 Among such approximations, we have the quantum Monte Carlo, 11,12 the variational Monte Carlo, 13 the density matrix renormalization group [14][15][16][17] as well as approximations based on matrix product and tensor network states. 18 Both the dynamical mean field theory and its cluster extensions [19][20][21][22][23][24][25][26] have made important contributions to our present knowledge of the Hubbard model. Other embedding approaches are also available.…”

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confidence: 99%

Multireference symmetry-projected variational approaches for ground and excited states of the one-dimensional Hubbard model

et al. 2013

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We present a multi-reference configuration mixing scheme for describing ground and excited states, with well defined spin and space group symmetry quantum numbers, of the one-dimensional Hubbard model with nearest-neighbor hopping and periodic boundary conditions. Within this scheme, each state is expanded in terms of non-orthogonal and variationally determined symmetry-projected configurations. The results for lattices up to 30 and 50 sites compare well with the exact LiebWu solutions as well as with results from other state-of-the-art approximations. In addition to spin-spin correlation functions in real space and magnetic structure factors, we present results for spectral functions and density of states computed with an ansatz whose quality can be well-controlled by the number of symmetry-projected configurations used to approximate the systems with Ne and Ne ± 1 electrons. The intrinsic symmetry-broken determinants resulting from the variational calculations have rich structures in terms of defects that can be regarded as basic units of quantum fluctuations. Given the quality of the results here reported, as well as the parallelization properties of the considered scheme, we believe that symmetry-projection techniques, which have found ample applications in nuclear structure physics, deserve further attention in the study of low-dimensional correlated many-electron systems.

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“…41,62,63 and employed by us to calculate the ARPES spectra of SrVO 3 . 62 ARPES computations have previously been performed also for the 2D Hubbard model by Maier et al 64 in the framework of the dynamical cluster approximation (DCA), 65 and by Sadovskii et al 66 within the so-called DMFT+Σ k approach.…”

Section: High-energy Bulk Arpes Experimentsmentioning

confidence: 99%

Evidence for strong electronic correlations in the spectra ofSr2RuO4

et al. 2007

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The importance of electronic correlation effects in the layered perovskite Sr2RuO4 is evidenced. To this end we use state-of-the-art LDA+DMFT (Local Density Approximation + Dynamical MeanField Theory) in the basis of Wannier functions to compute spectral functions and the quasiparticle dispersion of Sr2RuO4. The spectra are found to be in good agreement with various spectroscopic experiments. We also calculate the k-dependence of the quasiparticle bands and compare the results with new angle resolved photoemission (ARPES) data. Two typical manifestations of strong Coulomb correlations are revealed: (i) the calculated quasiparticle mass enhancement of m * /m ≈ 2.5 agrees with various experimental results, and (ii) the satellite structure at about 3 eV binding energy observed in photoemission experiments is shown to be the lower Hubbard band. For these reasons Sr2RuO4 is identified as a strongly correlated 4d electron material.

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Pseudogaps in the 2D Hubbard Model

Cited by 128 publications

References 22 publications

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

Multireference symmetry-projected variational approaches for ground and excited states of the one-dimensional Hubbard model

Evidence for strong electronic correlations in the spectra ofSr2RuO4

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Pseudogaps in the 2D Hubbard Model

Cited by 128 publications

References 22 publications

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High Tc Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High Tc Cuprates

Multireference symmetry-projected variational approaches for ground and excited states of the one-dimensional Hubbard model

Evidence for strong electronic correlations in the spectra ofSr2RuO4

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DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates

DMFT Study on the Electron–hole Asymmetry of the Electron Correlation Strength in the High T_c Cuprates