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Tree tensor-network real-time multiorbital impurity solver: Spin-orbit coupling and correlation functions in Sr2RuO4

We present a tree tensor-network impurity solver suited for general multiorbital systems. The network is constructed to efficiently capture the entanglement structure and symmetry of an impurity problem. The solver works directly on the real-time/frequency axis and generates spectral functions with...

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Hauptverfasser: Cao, Xiaodong (VerfasserIn) , Lu, Yi (VerfasserIn) , Hansmann, P. (VerfasserIn) , Haverkort, Maurits W. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 9 September 2021
In: Physical review
Year: 2021, Jahrgang: 104, Heft: 11, Pages: 1-16
ISSN:2469-9969
DOI:10.1103/PhysRevB.104.115119
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.104.115119
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.104.115119
Volltext
Verfasserangaben:X. Cao, Y. Lu, P. Hansmann, and M.W. Haverkort
Beschreibung
Zusammenfassung:We present a tree tensor-network impurity solver suited for general multiorbital systems. The network is constructed to efficiently capture the entanglement structure and symmetry of an impurity problem. The solver works directly on the real-time/frequency axis and generates spectral functions with energy-independent resolution of the order of one percent of the correlated bandwidth. Combined with an optimized representation of the impurity bath, it efficiently solves self-consistent dynamical mean-field equations and calculates various dynamical correlation functions for systems with off-diagonal Green's functions. For the archetypal correlated Hund's metal Sr2RuO4, we show that both the low-energy quasiparticle spectra related to the van Hove singularity and the high-energy atomic multiplet excitations can be faithfully resolved. In particular, we show that while the spin-orbit coupling has only minor effects on the orbital-diagonal one-particle spectral functions, it has a more profound impact on the low-energy spin and orbital response functions.
Beschreibung:Im Titel sind "2" und "4" in Sr2RuO4 tiefgestellt
Gesehen am 04.11.2021
Beschreibung:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.104.115119

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