Universität zu Köln

Micklitz, T., Monteiro, Felipe ORCID: 0000-0002-1655-9066 and Altland, Alexander ORCID: 0000-0002-2991-4805 (2019). Nonergodic Extended States in the Sachdev-Ye-Kitaev Model. Phys. Rev. Lett., 123 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We analytically study spectral correlations and many body wave functions of a Sachdev-Ye-Kitaev model deformed by a random Hamiltonian diagonal in Fock space. Our main result is the identification of a wide range of intermediate coupling strengths where the spectral statistics is of Wigner-Dyson type, while wave functions are nonuniformly distributed over Fock space. The structure of the theory suggests that such manifestations of nonergodic extendedness may be a prevalent phenomenon in many body chaotic quantum systems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Micklitz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Monteiro, Felipe UNSPECIFIED orcid.org/0000-0002-1655-9066 UNSPECIFIED Altland, Alexander UNSPECIFIED orcid.org/0000-0002-2991-4805 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-141228
DOI:	10.1103/PhysRevLett.123.125701
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	123
Number:	12
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ENERGY-LEVELS; TRANSITION; PHASE Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14122