Avalanche stability transition in interacting quasiperiodic systems
Yi-Ting Tu, DinhDuy Vu, S. Das Sarma
Abstract
Coupling a one-dimensional quasiperiodic interacting system to a Markovian bath, we study the avalanche instability of the many-body localized phase numerically, finding that many-body localization (MBL) is more stable in pseudorandom quasiperiodic systems than the corresponding randomly disordered systems for a disorder strength $W>8$, potentially up to arbitrarily large system sizes. We support our conclusion by additionally developing real-space RG arguments, and we provide a detailed comparison between quasiperiodic and random MBL from the avalanche instability perspective, concluding that the two belong to different universality classes.
Topics & Concepts
Quasiperiodic functionPhysicsInstabilityUniversality (dynamical systems)Statistical physicsCoupling (piping)Condensed matter physicsQuantum mechanicsMaterials scienceMetallurgyQuantum many-body systemsTheoretical and Computational PhysicsPhysics of Superconductivity and Magnetism