Berlin 2024 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Many-body Systems: Equilibration, Chaos, and Localization (joint session DY/TT)
DY 17.4: Vortrag
Dienstag, 19. März 2024, 10:15–10:30, A 151
Interplay of many-body interactions and quasiperiodic disorder in the all-bands-flat diamond chain — •Aamna Ahmed1, Nilanjan Roy2, and Auditya Sharma3 — 1University of Augsburg, Germany — 2Nanyang Technological University (NTU), Singapore — 3Indian Institute of Science Education and Research (IISER) Bhopal, India
While the physics of flat band systems, quasiperiodic disorder and many-body interactions have been important fields of activity, the interplay of these features has only scantily been explored. This talk will discuss the effect of many-body interactions and quasiperiodic Aubry André (AA) disorder on the one-dimensional all-band-flat (ABF) diamond lattice[1,2].
We show that coupling the ABF diamond lattice with nearest-neighbour interactions yields a non-ergodic phase independent of the strength of interaction. Interestingly, the resulting phases in the interacting diamond lattice depend on the symmetry and the strength of the applied quasiperiodic disorder. An exciting finding is the emergence of non-equilibrium quantum caging behaviour for specially engineered many-body initial states. Our work provides an insight into the phase diagram of an interacting flat band system subjected to quasiperiodic disorder via a non-equilibrium dynamical study.
1. Interplay of many-body interactions and quasiperiodic disorder in the all-band-flat diamond chain, PRB 107, 245110 (2023)
2.Flat-band-based multifractality in the all-band-flat diamond chain, PRB 106, 205119 (2022)
Keywords: Flat band system; Compact localization; Many body dynamics; Quasiperiodic disorder