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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

Dieplinger, Johannes , Bera, Soumya and 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, p. 168503.

Date of publication of this fulltext: 21 May 2021 05:09
Article
DOI to cite this document: 10.5283/epub.45834


Abstract

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

Item typeArticle
Journal or Publication TitleAnnals of Physics
Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:SAN DIEGO
Volume:435
Page Range:p. 168503
DateDecember 2021
InstitutionsPhysics > Institute of Theroretical Physics > Chair Ferdinand Evers
Identification Number
ValueType
10.1016/j.aop.2021.168503DOI
KeywordsQUANTUM; BEHAVIOR;
Dewey Decimal Classification500 Science > 530 Physics
StatusPublished
RefereedYes, this version has been refereed
Created at the University of RegensburgPartially
URN of the UB Regensburgurn:nbn:de:bvb:355-epub-458343
Item ID45834

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