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Dieplinger, Johannes ; Bera, Soumya ; Evers, Ferdinand

An SYK-inspired model with density–density interactions: Spectral & wave function statistics, Green’s function and phase diagram

Artikel

Dieplinger, Johannes , Bera, Soumya und Evers, Ferdinand (2021) An SYK-inspired model with density–density interactions: Spectral & wave function statistics, Green’s function and phase diagram. Annals of Physics 435, S. 168503.

DOI zum Zitieren dieses Dokuments: 10.5283/epub.45834


Zusammenfassung

The Sachdev-Ye-Kitaev (SYK) model is a rare example of a strongly-interacting system that is analytically tractable. Tractability arises because the model is largely structureless by design and therefore artificial: while the interaction is restricted to two-body terms, interaction matrix elements are "randomized" and therefore the corresponding interaction operator does not commute with the ...

The Sachdev-Ye-Kitaev (SYK) model is a rare example of a strongly-interacting system that is analytically tractable. Tractability arises because the model is largely structureless by design and therefore artificial: while the interaction is restricted to two-body terms, interaction matrix elements are "randomized" and therefore the corresponding interaction operator does not commute with the local density. Unlike conventional density-density-type interactions, the SYK-interaction is, in this sense, not integrable. We here investigate a variant of the (complex) SYK model, which restores this integrability. It features a randomized single-body term and a density-density-type interaction. We present numerical investigations suggesting that the model exhibits two integrable phases separated by several intermediate phases including a chaotic one. The chaotic phase carries several characteristic SYK-signatures including in the spectral statistics and the frequency scaling of the Green's function and therefore should be adiabatically connected to the non-Fermi liquid phase of the original SYK model. Thus, our model Hamiltonian provides a bridge from the SYK-model towards microscopic realism. (C) 2021 Elsevier Inc. All rights reserved.



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Details

DokumentenartArtikel
Titel eines Journals oder einer ZeitschriftAnnals of Physics
VerlagACADEMIC PRESS INC ELSEVIER SCIENCE
Ort der VeröffentlichungSAN DIEGO
Band435
SeitenbereichS. 168503
DatumDezember 2021
Veröffentlichungsdatum21 Mai 2021 05:09
InstitutionenPhysik > Institut für Theoretische Physik > Lehrstuhl Ferdinand Evers
Identifikationsnummer
WertTyp
10.1016/j.aop.2021.168503DOI
Stichwörter / KeywordsQUANTUM; BEHAVIOR;
Dewey-Dezimal-Klassifikation500 Naturwissenschaften und Mathematik > 530 Physik
StatusVeröffentlicht
BegutachtetJa, diese Version wurde begutachtet
An der Universität Regensburg entstandenZum Teil
URN der UB Regensburgurn:nbn:de:bvb:355-epub-458343
Dokumenten-ID45834

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