Dresden 2026 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Many-body Systems: Equilibration, Chaos, and Localization (joint session DY/TT)
DY 32.11: Vortrag
Mittwoch, 11. März 2026, 12:15–12:30, HÜL/S186
Robustness of interference-caged QMBS under real-space local perturbations: analysis through the Fock-space local interference pattern — •Tao-Lin Tan1 and Yi-Ping Huang1,2,3 — 1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan — 2Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan — 3Institute of Physics, Academia Sinica, Taipei 115, Taiwan
Quantum many-body scars (QMBS) represent a notable violation of the eigenstate thermalization hypothesis (ETH), hosting non-thermal eigenstates embedded in an otherwise thermal spectrum. Despite recent progress, a systematic understanding of their stability under real-space local (r-local) perturbations remains lacking. Building on recent insights of interference-caged quantum many-body scars (ICQMBS), protected by exact many-body destructive interference on Fock-space graphs, we develop an interference-based diagnostic to assess the robustness of ICQMBS in various lattice Hamiltonians. Applying this framework to quantum link models (QLM) and quantum dimer models (QDM), we analyze how r-local perturbations deform the underlying Fock-space local (f-local) interference structure, thereby identifying heuristic mechanisms that stabilize or destabilize ICQMBS. Our results broaden the applicability of the interference-based perspective beyond previously studied models and provide practical criteria for evaluating the persistence of ICQMBS in experimentally relevant Hamiltonians.
Keywords: Interference-caged quantum many-body scars; Destructive interference; Fock-space graphs; Stability of quantum many-body scars