<div class="csl-bib-body">
<div class="csl-entry">Toschi, A. (2023, July). <i>Characteristic Timescales and Longterm- Memory Effects in Correlated Many-Electron Systems</i> [Conference Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Stuttgart, Germany. http://hdl.handle.net/20.500.12708/193289</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/193289
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dc.description
Our perception of the natural world is significantly shaped by the properties of the detection process considered. One crucial aspect is the timescale of the probing mechanism: If this is larger than the typical timescales of the phenomenon under investigation, only averaged information will be gained.
I will illustrate the importance of this aspect for the comparison of experimental observations and theoretical calculations of correlated quantum materials, by hands of an ab-initio+dynamical mean-field study [1] of the on-site magnetic fluctuations in several Fe-bases pnictides and chalcogenides. In this respect, I will also highlight the pivotal role played by vertex corrections in driving the slowing-down of the temporal magnetic fluctuations, as it occurs, e.g., in the proximity of Mott-Hubbard/Hund's-Mott metal-to-insulator transitions and of quantum critical points.
Further, I will examine the situations in which the information encoded in the dynamical correlation functions does not completely vanish even in the infinite-time limit, by hands [2] of exact-diagonalization and dynamical mean-field calculations of Hubbard rings and of the Hubbard model, respectively. This analysis will illustrate how to link the asymptotic long-time response of correlated electrons to intrinsic features of the underlying (exact) many-particle energy spectrum, as well as, perspectively, to the entropy of the system under consideration.
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dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.language.iso
en
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dc.subject
dynamical mean field theory
en
dc.subject
Hubbard model
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dc.subject
magnetism
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dc.title
Characteristic Timescales and Longterm- Memory Effects in Correlated Many-Electron Systems
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.relation.grantno
I 5868-N
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dc.type.category
Conference Presentation
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tuw.publication.invited
invited
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tuw.project.title
Quantum phase transitions and collective modes
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tuw.researchTopic.id
Q6
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tuw.researchTopic.id
C1
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tuw.researchTopic.name
Quantum Many-body Systems Physics
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tuw.researchTopic.name
Computational Materials Science
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tuw.researchTopic.value
70
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tuw.researchTopic.value
30
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tuw.publication.orgunit
E138-02 - Forschungsbereich Correlations: Theory and Experiments
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tuw.author.orcid
0000-0001-5669-3377
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tuw.event.name
Workshop "Correlations in Novel Quantum Materials" 2023
