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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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Dieplinger, JohannesPreview
, 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.
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Dieplinger, Johannes
, Soumya, Bera and Evers, Ferdinand
(2021)
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Details
| Item type | Article | ||||
| Journal or Publication Title | Annals of Physics | ||||
| Publisher: | ACADEMIC PRESS INC ELSEVIER SCIENCE | ||||
|---|---|---|---|---|---|
| Place of Publication: | SAN DIEGO | ||||
| Volume: | 435 | ||||
| Page Range: | p. 168503 | ||||
| Date | December 2021 | ||||
| Institutions | Physics > Institute of Theroretical Physics > Chair Ferdinand Evers | ||||
| Identification Number |
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| Keywords | QUANTUM; BEHAVIOR; | ||||
| Dewey Decimal Classification | 500 Science > 530 Physics | ||||
| Status | Published | ||||
| Refereed | Yes, this version has been refereed | ||||
| Created at the University of Regensburg | Partially | ||||
| URN of the UB Regensburg | urn:nbn:de:bvb:355-epub-458343 | ||||
| Item ID | 45834 |
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