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Interplay of many-body interactions and quasiperiodic disorder in the all-bands-flat diamond chain.

Ahmed, A and Roy, N and Sharma, A (2023) Interplay of many-body interactions and quasiperiodic disorder in the all-bands-flat diamond chain. In: Physical Review B, 107 (24).

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Official URL: https://doi.org/10.1103/PhysRevB.107.245110


We study the effects of quasiperiodic Aubry-André (AA) disorder and interactions on a one-dimensional all-bands-flat (ABF) diamond chain. We consider the application of disorder in two ways: A symmetric one, where the same disorder is applied to the top and bottom sites of a unit cell, and an antisymmetric one, where the disorder applied to the top and bottom sites are of equal magnitude but with opposite signs. The single-particle wave-packet dynamics for the clean system and when the disorder is applied symmetrically show quantum caging; in the antisymmetric case, the wave packet spreads over the entire lattice. These results agree with our previous study, where compact localization was observed in the case of the clean system and for symmetrically disordered diamond lattices. In the presence of nearest-neighbor interactions, nonergodic phases are observed in the case of a clean system and symmetrical disorder; at higher disorder strengths, we find an MBL-like phase in the symmetric case. However, many-body nonequilibrium dynamics of the system from carefully engineered initial states exhibit quantum caging. In the antisymmetric case, a nonergodic mixed phase, a thermal phase, and an MBL-like phases, respectively, are observed at low, intermediate, and high disorder strengths. We observe an absence of caging and initial state dependence (except at the intermediate disorder strength) in the study of nonequilibrium dynamics.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Author.
Keywords: Diamonds; Dynamics, Anti-symmetric; Clean systems; Diamond chain; Disorder strength; Initial state; Many-body interactions; Non-equilibrium dynamics; One-dimensional; Quasi-periodic; Two ways, Wave packets
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Jul 2023 09:50
Last Modified: 18 Jul 2023 09:50
URI: https://eprints.iisc.ac.in/id/eprint/82457

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