Itinerant-localized model of strongly correlated electrons: Fermi surface reconstruction

Ivantsov, Ilya; Ferraz, A.; Kochetov, Evgueny

doi:10.1103/physrevb.96.195161

Cited by 3 publications

(2 citation statements)

References 22 publications

(25 reference statements)

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“…We note that Fermisurfaces of this type have been obtained recently using CPT with 3x3 and 4x4 clusters within a t-J-type model (see Ref. 69). The Fermi surface evolution, when plotted with a large value of a Lorentzian broadening (see the right column of Fig.…”

Section: The Hubbard Modelsupporting

confidence: 59%

Effect of Short-Range Correlations on Spectral Properties of Doped Mott Insulators

Kuz’min

Николаев

Овчинников

2018

J Supercond Nov Magn

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In the framework of cluster perturbation theory for the 2D Hubbard and Hubbard-Holstein models at low hole doping we have studied the effect of local and short-range correlations in strongly correlated systems on the anomalous features in the electronic spectrum by investigating the fine structure of quasiparticle bands. Different anomalous features of spectrum are obtained as the result of intrinsic properties of strongly correlated electron and polaron bands in the presence of shortrange correlations. Particularly, features similar to the electron-like Fermi-pockets of cuprates at hole doping p ∼ 0.1 are obtained without ad hoc introducing a charge density wave order parameter within the Hubbard model in a unified manner with other known peculiarities of the pseudogap phase like Fermi-arcs, pockets, waterfalls, and kink-like features. The Fermi surface is mainly formed by dispersive quasiparticle bands with large spectral weight, formed by coherent low-energy exications. Within the Hubbard-Holstein model at moderate phonon frequencies we show that modest values of local electron-phonon interaction are capable of introducing low-energy kink-like features and affecting the Fermi surface by hybridization of the fermionic quasiparticle bands with the Franck-Condon resonances.

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Section: The Hubbard Modelsupporting

confidence: 59%

Effect of Short-Range Correlations on Spectral Properties of Doped Mott Insulators

Kuz’min

Николаев

Овчинников

2018

J Supercond Nov Magn

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“…Whereas CPT has been extensively used to study doping dependent electronic structure of models of strong electronic correlations at zero temperature 28,29,46,[51][52][53][54][55][56][57][58] and applied several times at finite temperatures 59,60 , to our knowledge there exists no detailed investigation of the temperature dependence of the pseudogap within CPT. Although CPT is not a self-consistent method (contrary to VCA or CDMFT) and thus cannot be used by itself to study ordered phases, since the pseudogap is a normal state phenomenon, CPT is fully applicable in our case.…”

Section: Model and Methodsmentioning

confidence: 99%

Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model

et al. 2020

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Cluster perturbation theory is applied to the two-dimensional Hubbard t − t ′ − t ′′ − U model to obtain doping and temperature dependent electronic spectral function with 4×4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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Fermi surface reconstruction in underdoped cuprates: Origin of electron pockets

Ivantsov¹,

Ferraz²,

Kochetov³

2018

Phys. Rev. B

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A new phenomenological model is proposed to describe the evolution of the Fermi surface (FS) in a wide range of dopings. It reproduces the key features of the cuprates in the underdoped phase above the superconducting temperature Tc. It is shown that the explicit accounting of strong electron correlation in the framework of the t−J model taken in complementary to the translational symmetry breaking induced by the charge density wave (CDW) gives rise to the Fermi surface reconstruction (FSR) into small electron pockets. While the strong Coulomb repulsion leads to an emergence of the arc-like Fermi surface in the pseudogap (PG) phase, the Bragg reflection on the boundaries of the reduced Brillouin zone (BZ) opens up a possibility to close the quasiparticle orbits. Direct calculation of the FS properties allows us to unveil the scenario of the experimentally observed transition to the CDW phase that sets in at the doping level δ ≈ 0.08 and is accompanied by a divergence of the carriers effective mass and the sign reversals of the Hall and Seebeck coefficients.Introduction. The discovery of quantum oscillations in the underdoped YBa 2 Cu 3 O 6+δ (YBCO) in a high magnetic field[1-3] revealed among other features a reconstruction of the Fermi surface into small pockets. Further measurements[4] also established that the area of the FS is proportional to the doping value δ instead of the 1 + δ as predicted by the conventional Fermi liquid (FL) theory. The sign changes of both Hall[5] and Seebeck[6] coefficients in the doping range of 0.08 < δ < 0.16 indicates that, at a low temperature, electron-like pockets emerge due to the translation symmetry breaking that takes place in the ground state of the non-superconducting phase. The subsequent detection of quantum oscillations in YBa 2 Cu 4 O 8 [7,8], HgBa 2 CuO 4+δ [9] and other compounds [10][11][12][13][14] confirms that such a FSR is a generic property of the underdoped cuprates.All those compounds reveal the presence of the CDW modulation right at the very doping level where the FSR has been detected. It was shown that, for YBCO, the incommensurate CDW modulation vectors lie in the CuO plane and they take the form Q x = 2π(Q, 0) and Q y = 2π(0, Q) with Q ≈ 0.31 [15][16][17][18]. This CDW ordering with a period varying from 3 to 5 lattice spacings has also been detected by scanning tunneling microscopy (STM) and x-ray diffraction (XRD) studies in underdoped cuprates [19][20][21][22][23][24][25][26][27][28]. Those experimental evidences strongly suggest that this charge ordering indeed is the leading cause for the observed FSR. Also, a number of experiments revealed a predominant d-wave form factor of the CDW ordering [29][30][31].The phenomenological calculations confirm that the electron-like pockets in the nodal regions can be obtained within the one band phenomenological tight-binding model by breaking translation symmetry by multiple-Q ordering [32]. Extending that model to incorporate a long-range charge order with the d-form factor [33] pro-

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Itinerant-localized model of strongly correlated electrons: Fermi surface reconstruction

Cited by 3 publications

References 22 publications

Effect of Short-Range Correlations on Spectral Properties of Doped Mott Insulators

Effect of Short-Range Correlations on Spectral Properties of Doped Mott Insulators

Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model

Fermi surface reconstruction in underdoped cuprates: Origin of electron pockets

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