5 papers
Tunable Hilbert space fragmentation and extended critical regime
Mateusz Lisiecki, Janez BonÄa, Marcin Mierzejewski +2
Systems exhibiting the Hilbert-space fragmentation are nonergodic, and their Hamiltonians decompose into exponentially many blocks in the computational basis. In many cases, these…
Localization transitions in quadratic systems without quantum chaos
Mateusz Lisiecki, Lev Vidmar, Patrycja Åydżba
Transitions from delocalized to localized eigenstates have been extensively studied in both quadratic and interacting models. The delocalized regime typically exhibits diffusion an…
Normal weak eigenstate thermalization
Patrycja Åydżba, RafaÅ ÅwiÄtek, Marcin Mierzejewski +2
Eigenstate thermalization has been numerically shown to occur for few-body observables in a wide range of nonintegrable models. For intensive sums of few-body observables, a weaker…
Fading ergodicity meets maximal chaos
RafaÅ ÅwiÄtek, Patrycja Åydżba, Lev Vidmar
Fading ergodicity provides a theoretical framework for understanding deviations from the eigenstate thermalization hypothesis (ETH) near ergodicity-breaking transitions. In this wo…
Local integrals of motion in dipole-conserving models with Hilbert space fragmentation
Patrycja Åydżba, Peter PrelovÅ¡ek, Marcin Mierzejewski
Hilbert space fragmentation is an ergodicity breaking phenomenon, in which Hamiltonian shatters into exponentially many dynamically disconnected sectors. In many fragmented systems…