Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices

Mondaini, Rubem; Paiva, Thereza

doi:10.1103/physrevb.95.075142

Cited by 8 publications

(3 citation statements)

References 57 publications

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“…This is somewhat surprising since V connects d 1 -sites directly to f -sites, but does not hybridize the d 0 sites at all, and, more importantly, d-sites have U = 0. A similar behavior was recently observed 64 in the Hubbard model on a 2D superlattice with alternating rows of correlated and uncorrelated sites of different widths.…”

Section: Half Depletionsupporting

confidence: 85%

Compressible ferrimagnetism in the depleted periodic Anderson model

et al. 2018

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Tight-binding Hamiltonians with single and multiple orbitals exhibit an intriguing array of magnetic phase transitions. In most cases the spin ordered phases are insulating, while the disordered phases may be either metallic or insulating. In this paper we report a Determinant Quantum Monte Carlo study of interacting electrons in a geometry which can be regarded as a two-dimensional Periodic Anderson Model with depleted interacting (f ) orbitals. For a single depletion, we observe an enhancement of antiferromagnetic correlations and formation of localized states. For half of the f -orbitals regularly depleted, the system exhibits a ferrimagnetic ground state. We obtain a quantitative determination of the nature of magnetic order, which we discuss in the context of Tsunetsugu's theorem, and show that, although the dc conductivity indicates insulating behavior at half-filling, the compressibility remains finite.

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Section: Half Depletionsupporting

confidence: 85%

Compressible ferrimagnetism in the depleted periodic Anderson model

et al. 2018

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“…In the range of U < 6, our results are consistent with Ref. [52], and when U increases to a large value, the repulsive sites push electrons to the free sites and induce them to be doubly occupied, so we speculate that ( mz i ) 2 0 will finally taper off to 0.5 [52].…”

Section: Resultssupporting

confidence: 88%

An intermediate phase induced by dilution in a correlated Dirac Fermi system

Tian¹,

Meng²,

Ma³

2022

Preprint

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Substituting magnetic ions with nonmagnetic ions is a new way to study dilution. Using determinant quantum Monte Carlo calculations, we investigate an interacting Dirac fermion model with the on-site Coulomb repulsion being randomly zero on a fraction x of sites. Based on conductivity, density of states and antiferromagnetic structure factor, our results reveal a novel intermediate insulating phase induced by the competition between dilution and repulsion. With increasing doping level of nonmagnetic ions, this nonmagnetic intermediate phase is found to emerge from the zero-temperature quantum critical point separating a metallic and a Mott insulating phase, whose robustness is proven over a wide range of interactions. Under the premise of strongly correlated materials, we suggest that doping nonmagnetic ions can effectively convert the system back to the paramagnetic metallic phase. This result not only agrees with experiments on the effect of dilution on magnetic order but also provides a possible direction for studies focusing on the metal-insulator transition in honeycomb lattice like materials.

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“…The experimental availability of quantum simulators is one of the recent scientific achievements [1][2][3][4][5][6] . They allow one to simulate and explore a variety of complex many-body systems, in particular, the magnetic ones, and to verify the corresponding theoretical models yet unstudied or which can hardly (or even not at all) be directly investigated in solids [7][8][9][10][11][12] . The most actively studied quantum simulators are those implementing ultracold atoms in optical lattices [13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase diagram and quantum phase transitions in a two-species boson model

et al. 2017

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We analyze the possible types of ordering in a boson-fermion model. The Hamiltonian is inherently related to the Bose-Hubbard model for vector two-species bosons in optical lattices. We show that such model can be reduced to the Kugel-Khomskii type spin-pseudospin model, but in contrast to the usual version of the latter model, we are dealing here with the case of spin S = 1 and pseudospin 1/2. We show that the interplay of spin and pseudospin degrees of freedom leads to a rather nontrivial magnetic phase diagram including the spin-nematic configurations. Tuning the spin-channel interaction parameter Us gives rise to quantum phase transitions. We find that the ground state of the system always has the pseudospin domain structure. On the other hand, the sign change of Us switches the spin arrangement of the ground state within domains from ferro-to aniferromagnetic one. Finally, we revisit the spin (pseudospin)-1/2 Kugel-Khomskii model and see the inverse picture of phase transitions.

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Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices

Cited by 8 publications

References 57 publications

Compressible ferrimagnetism in the depleted periodic Anderson model

Compressible ferrimagnetism in the depleted periodic Anderson model

An intermediate phase induced by dilution in a correlated Dirac Fermi system

Magnetic phase diagram and quantum phase transitions in a two-species boson model

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