Ground-state phase diagrams of the generalized Falicov-Kimball model with Hund coupling

Lemański, R.; Wrzodak, Jakub

doi:10.1103/physrevb.78.085118

Cited by 18 publications

(10 citation statements)

References 45 publications

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“…Unlike previous studies [9,[18][19][20], that have been done Thus we can conclude that the separated and axial striped phases enhance the average vertex correlations in the spin-one-half FKM with U f d , J z and U dd couplings, while the regular phases have only a small impact on the d x 2 −y 2 superconducting correlations in this model. Unfortunately, for half and quarter f and d electron fillings analysed above we have found no pure axial striped phases, as observed in the experiments for some cuprate, nikelate and cobaltate systems and therefore we turn our attention to the case n f + n d = 1 and n f + n d = 2, where such phases have been widely observed for both J z = 0 as well as J z > 0, even in the limit U dd = 0.…”

Section: Modelcontrasting

confidence: 48%

Enhancement of the d -wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling

Farkašovský¹

2016

EPL

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Projector Quantum-Monte-Carlo Method is used to examine effects of the spin-independent U f d as well as spin-dependent J z Coulomb interaction between the localized f and itinerant d electrons on the stability of various types of charge/spin ordering and superconducting correlations in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling. The model is studied for a wide range of f and d-electron concentrations and it is found that the interband interactions U f d and J z stabilize three basic types of charge/spin ordering, and namely, (i) the axial striped phases, (ii) the regular n-molecular phases and (iii) the phase separated states. It is shown that the d-wave pairing correlations are enhanced within the axial striped and phase separated states, but not in the regular phases. Moreover, it was found that the antiferromagnetic spin arrangement within the chains further enhances the d-wave paring correlations, while the ferromagnetic one has a fully opposite effect.

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Section: Modelcontrasting

confidence: 48%

Enhancement of the d -wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling

Farkašovský¹

2016

EPL

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“…Indeed, using the restricted phase diagram method 7,8 and small cluster diagonalization calculations 9 many different charge and magnetic superstructures were found. Fortunately, a few simple rules of formation of the phases were detected.…”

Section: Introductionmentioning

confidence: 99%

Energy spectrum analysis and finite temperature properties of the Falicov-Kimball model with Hund coupling at half filling

Wrzodak

Lemański

2010

Phys. Rev. B

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The Falicov-Kimball model supplemented with the Ising-type Hund coupling describes charge and magnetic order induced by on-site, charge-, and spin-dependent interactions between itinerant electrons and localized ions. Motivated by a discovery of the rich structure of ground-state phase diagrams containing various charge and magnetic superstructures, we analyze the energy spectrum and determine numerically finite temperature properties of the model on the square 4 ϫ 4 cluster at half filling. For the density of magnetic ions equal to 1 and 1/2 and not too small coupling constants we show that many-electron collective excitations derived from changes in positions of the ions or inversions their spins have much lower energy than single-electron excitations. From an analysis of the excitation spectrum structure we derive effective interactions between the ions. When the coupling constants are large enough the interactions reduce to two-body forces between ions occupying the nearest-neighboring sites. Finite-temperature characteristics and temperatures of transformation from charge or magnetically ordered to disordered phases are determined in the wide range of the interaction couplings.

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“…This opens a vast variety of problems that can be addressed by the used method and various extensions of the FKM. Besides investigating other regimes of the spinless FKM, e.g., the vicinity of the PHS case where various nonhomogeneouse axial orderings compete with full CDW phase [71], insight into the spin-resolved current can be gained from the investigation of the transport through the spinfull version of the FKM, where the homogeneous charge orderings are accompanied by different spin orderings [76,129,130]. Such studies are expected to be particularly interesting in the context of spintronics.…”

Section: Discussionmentioning

confidence: 99%

Electronic transport through correlated electron systems with nonhomogeneous charge orderings

2020

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The spinless Falicov-Kimball model exhibits outside the particle-hole symmetric point different stable nonhomogeneous charge orderings. These include the well known charge stripes and a variety of orderings with phase separated domains, which can significantly influence the charge transport through the correlated electron system. We show this by investigating a heterostructure, where the Falicov-Kimball model on a finite two-dimensional lattice is located between two non-interacting semi-infinite leads. We use a combination of nonequilibrium Green's functions techniques with a signproblem-free Monte Carlo method for finite temperatures or simulated annealing technique for the ground state to address steady-state transport through the system. We show that different groundstate phases of the central system can lead to simple metallic-like or insulating charge transport characteristics, but also to more complicated current-voltage dependencies reflecting a multi-band character of the transmission function. Interestingly, with increasing temperature, the orderings tend to form transient phases before the system reaches the disordered phase. This leads to nontrivial temperature dependencies of transmission function and charge current.

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Ground-state phase diagrams of the generalized Falicov-Kimball model with Hund coupling

Cited by 18 publications

References 45 publications

Enhancement of the d -wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling

Enhancement of the d -wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling

Energy spectrum analysis and finite temperature properties of the Falicov-Kimball model with Hund coupling at half filling

Electronic transport through correlated electron systems with nonhomogeneous charge orderings

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