Charge stripes in the two-orbital Hubbard model for iron pnictides

Luo, Qinlong; Yao, Dao‐Xin; Moreo, Adriana; Dagotto, Elbio

doi:10.1103/physrevb.83.174513

Cited by 18 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculation for stripes in pnictides was carried out by members of our group and the results were reported in Ref. [88], and some results are reproduced in this section. In Fig.…”

Section: Are There Charge Stripes In Models For Pnictides?mentioning

confidence: 98%

Properties of the multiorbital Hubbard models for the iron-based superconductors

et al. 2011

Self Cite

View full text Add to dashboard Cite

A brief review of the main properties of multiorbital Hubbard models for the Fe-based superconductors is presented. The emphasis is on the results obtained by our group at the University of Tennessee and Oak Ridge National Laboratory, Tennessee, USA, but results by several other groups are also discussed. The models studied here have two, three, and five orbitals, and they are analyzed using a variety of computational and mean-field approximations. A "physical region" where the properties of the models are in qualitative agreement with neutron scattering, photoemission, and transport results is revealed. A variety of interesting open questions are briefly discussed such as: what are the dominant pairing tendencies in Hubbard models? Can pairing occur in an interorbital channel? Are nesting effects of fundamental relevance in the pnictides or approaches based on local moments are more important? What kind of magnetic states are found in the presence of iron vacancies? Can charge stripes exist in iron-based superconductors? Why is transport in the pnictides anisotropic? The discussion of results includes the description of these and other open problems in this fascinating area of research.

show abstract

“…The calculation for stripes in pnictides was carried out by members of our group and the results were reported in Ref. [88], and some results are reproduced in this section. In Fig.…”

Section: Are There Charge Stripes In Models For Pnictides?mentioning

confidence: 98%

Properties of the multiorbital Hubbard models for the iron-based superconductors

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…[23][24][25][26] The two-orbital Hubbard model studied here is defined as: z i,α = (1/2)(n i,α,↑ − n i,α,↓ ). U , U , J, and J are the Kanamori parameters.…”

Section: Model and Methodsmentioning

confidence: 99%

“…Mean-field approximations have already been applied to two-orbital Hubbard models at T =0, 25,26 showing several phases with increasing U/W : a paramagnetic metal, a metal with (π, 0) spin order, and an insulator also with (π, 0) spin order. These previous T =0 studies and others [1][2][3][4] showed that J/U ∼ 0.15−0.30 is relevant for FeSC, and we will fix J/U = 0.25 in all the results below.…”

Section: Model and Methodsmentioning

confidence: 99%

Orbital selective directional conductor in the two-orbital Hubbard model

Mukherjee¹,

Patel²,

Moreo³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

Employing a recently developed many-body technique that allows for the incorporation of thermal effects, the rich phase diagram of a two dimensional two orbital (degenerate dxz and dyz) Hubbard model is presented varying temperature and the repulsion U . Our main result is the finding at intermediate U of a novel antiferromagnetic orbital selective state where an effective dimensional reduction renders one direction insulating and the other metallic. Possible realizations of this state are discussed. In addition we also study nematicity above the Néel temperature. After a careful finite-size scaling analysis the nematicity temperature window appears to survive in the bulk limit although it is very narrow.

show abstract

“…Numerical methods generally also use various simplifications for modeling the Hamiltonian of the two-orbital model. Charge stripes states were obtained in [7] within the real-space Hartree-Fock approximation away from the half-filling. Quasi one-dimensional "ladder" geometry was used in [8] for the study of the properties of the ground state of the two-orbital model by density matrix renormalization group approach.…”

Section: Introductionmentioning

confidence: 99%

Momentum distribution and non-Fermi-liquid behavior in low-doped two-orbital model: Finite-size cluster quantum Monte Carlo approach

2016

View full text Add to dashboard Cite

The two-dimensional two-orbital Hubbard model is studied with the use of finite-size cluster worldline quantum Monte Carlo algorithm. This model is widely used for simulation of the band structure of FeAs clusters, which are structure elements of Fe-based high-temperature superconductors. The choice of a special basis set of hyper-sites allowed to take into account four-fermion operator terms and to overcome partly the sign problem. Spectral functions and the density of states for various parameters of the model are obtained in the undoped and low-doped regimes. The correlated distortion of the spectral density with the change of doping is observed, and the applicability of the "hard-band" approximation in the doped regime is demonstrated. Profiles of the momentum distribution are obtained for the first Brillouin zone; they have pronounced jump near the Fermi level, which decreases with the growth of the strength of the interaction. The invariance of the Fermi surface with respect to the strength of the interaction is testified. Nesting is found in the case of electron and hole doping. Fermi-liquid parameters of the model are derived. Z-factor grows sharply with the increasing the level of doping, and monotonously decreases with the growth of the strength of the interaction. Moreover, electron-hole doping asymmetry of the Z-factor is revealed. The non-Fermi liquid behaviour and the deviation from Luttinger theorem are observed.

show abstract

Charge stripes in the two-orbital Hubbard model for iron pnictides

Cited by 18 publications

References 33 publications

Properties of the multiorbital Hubbard models for the iron-based superconductors

Properties of the multiorbital Hubbard models for the iron-based superconductors

Orbital selective directional conductor in the two-orbital Hubbard model

Momentum distribution and non-Fermi-liquid behavior in low-doped two-orbital model: Finite-size cluster quantum Monte Carlo approach

Contact Info

Product

Resources

About