Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

Geffroy, Dominique Alain; Kaufmann, Josef; Hariki, Atsushi; Gunacker, Patrik; Hausoel, Andreas; Kuneš, J.

doi:10.1103/physrevlett.122.127601

Cited by 52 publications

(41 citation statements)

References 59 publications

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“…(10) we show the absorptive (imaginary) parts of the dynamical susceptibilities obtained by the analytic continuation described in Supplemental Material of Ref. [33]. It reveals the Goldstone nature of the Rφ y response and complex nature of the spin response.…”

Section: The Model Hamiltonian Readsmentioning

confidence: 91%

“…Next, we apply the present IR approach to a state-of-art linear response DMFT calculation. To this end, we choose the two-band Hubbard model in an intermediate coupling regime and low-spontaneously broken-symmetry, a problem that some of us have studied recently [33]. Figure 7: Physical lattice susceptibility χ(q) computed for the single-band Hubbard model on the square lattice at U = 1.5W and β = 2.5.…”

Section: Dmft Calculations For Two-band Hubbard Modelmentioning

confidence: 99%

“…The rest, expressed in terms of local densities n c i,σ ≡ c † iσ c iσ , captures the crystal-field ∆, the Hubbard interaction U and Hund's exchange J in the Ising approximation. We use the same hopping parameters t a = 0.4118, t b = −0.1882 as in [33], but choose weaker interaction U = 2 (J = U/4, U = U − 2J) and ∆ = 1.55. At the studied temperature β = 60, an ordered phase called polar excitonic condensate [34] is realized.…”

Section: The Model Hamiltonian Readsmentioning

confidence: 99%

“…Using the above data we can solve the BSE to get the linear response of our system. As Figure 9: Selected components of the static susceptibility χ(q) throughout the Brillouin zone, for the two-band Hubbard model described in the text, for β = 60. an example we calculate the diagonal susceptibilities for local operators [33]…”

Section: The Model Hamiltonian Readsmentioning

confidence: 99%

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Overcomplete compact representation of two-particle Green's functions

et al. 2018

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Many-body calculations at the two-particle level require a compact representation of two-particle Green's functions. In this paper, we introduce a sparse sampling scheme in the Matsubara frequency domain as well as a tensor network representation for two-particle Green's functions. The sparse sampling is based on the intermediate representation basis and allows an accurate extraction of the generalized susceptibility from a reduced set of Matsubara frequencies. The tensor network representation provides a system independent way to compress the information carried by two-particle Green's functions. We demonstrate efficiency of the present scheme for calculations of static and dynamic susceptibilities in single-and two-band Hubbard models in the framework of dynamical mean-field theory.

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Section: The Model Hamiltonian Readsmentioning

confidence: 91%

Section: Dmft Calculations For Two-band Hubbard Modelmentioning

confidence: 99%

Section: The Model Hamiltonian Readsmentioning

confidence: 99%

Section: The Model Hamiltonian Readsmentioning

confidence: 99%

See 2 more Smart Citations

Overcomplete compact representation of two-particle Green's functions

et al. 2018

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“…(12) Here, an analytic continuation to real frequencies is necessary, for which we employ the maximum entropy method described in the supplemental material of Ref. 24.…”

Section: Postprocessingmentioning

confidence: 99%

Parquet dual fermion approach for the Falicov-Kimball model

et al. 2020

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In the Falicov-Kimball model, a model for (annealed) disorder, we expect weak localization corrections to the optical conductivity. However, we get such weak localization effects only when employing a pp-ladder approximation in the dual fermion approach. In the full parquet approach these pp-contributions are suppressed by ph-reducible diagrams. For the optical conductivity, we find that the ph-channel yields the main contribution, even in the region where weak localization in the pp-ladder was indicated.

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Toward Functionalized Ultrathin Oxide Films: The Impact of Surface Apical Oxygen

Gabel

Pickem

Scheiderer

et al. 2021

Adv Elect Materials

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Thin films of transition metal oxides open up a gateway to nanoscale electronic devices beyond silicon characterized by novel electronic functionalities. While such films are commonly prepared in an oxygen atmosphere, they are typically considered to be ideally terminated with the stoichiometric composition. Using the prototypical correlated metal SrVO3 as an example, it is demonstrated that this idealized description overlooks an essential ingredient: oxygen adsorbing at the surface apical sites. The oxygen adatoms, which are present even if the films are kept in an ultrahigh vacuum environment and not explicitly exposed to air, are shown to severely affect the intrinsic electronic structure of a transition metal oxide film. Their presence leads to the formation of an electronically dead surface layer but also alters the band filling and the electron correlations in the thin films. These findings highlight that it is important to take into account surface apical oxygen or—mutatis mutandis—the specific oxygen configuration imposed by a capping layer to predict the behavior of ultrathin films of transition metal oxides near the single unit‐cell limit.

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Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

Cited by 52 publications

References 59 publications

Overcomplete compact representation of two-particle Green's functions

Overcomplete compact representation of two-particle Green's functions

Parquet dual fermion approach for the Falicov-Kimball model

Toward Functionalized Ultrathin Oxide Films: The Impact of Surface Apical Oxygen

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