Partial breakdown of quantum thermalization in a Hubbard-like model

Abstract

We study the possible breakdown of quantum thermalization in a model of itinerant electrons on a one-dimensional chain without disorder, with both spin and charge degrees of freedom. The eigenstates of this model exhibit peculiar properties in the entanglement entropy, the apparent scaling of which is modified from a "volume law" to an "area law" after performing a partial, site-wise measurement on the system. These properties and others suggest that this model realizes a new, non-thermal phase of matter, known as a quantum disentangled liquid (QDL). The putative existence of this phase has striking implications for the foundations of quantum statistical mechanics.

As accepted to PRB

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• Absence of Ergodicity without Quenched Disorder: from Quantum Disentangled Liquids to Many-Body Localization
• Operationally accessible entanglement of one dimensional spinless fermions
• Exact localized and ballistic eigenstates in disordered chaotic spin ladders and the Fermi-Hubbard model
• Absence of Thermalization in Finite Isolated Interacting Floquet Systems
• Slow Dynamics in Translation-Invariant Quantum Lattice Models
• Anyonic self-induced disorder in a stabilizer code: quasi-many body localization in a translational invariant model
• Entanglement transitions as a probe of quasiparticles and quantum thermalization
• Quantum-disentangled liquid in the half-filled Hubbard model
• Disentangling quantum matter with measurements
• Semiclassical dynamics of a disordered two-dimensional Hubbard model with long-range interactions
• Explicit construction of quasi-conserved local operator of translationally invariant non-integrable quantum spin chain in prethermalization
• $\eta$-pairing in correlated fermion models with spin-orbit coupling
• Hilbert space fragmentation at the origin of disorder-free localization in the lattice Schwinger model
• Exact phase diagram and topological phase transitions of the XYZ spin chain
• Hierarchical relaxation dynamics in a tilted two-band Bose-Hubbard model
• Exact results for the entanglement in 1D Hubbard models with spatial constraints
• Emergent statistical bubble localization in a Z2 lattice gauge theory
• Atypical energy eigenstates in the Hubbard chain and quantum disentangled liquids
• Quench dynamics of two component dipolar fermions subject to a quasiperiodic potential
• Numerical and quantum simulation of a quantum disentangled liquid