Many-Body Multifractality throughout Bosonic Superfluid and Mott Insulator Phases
Many-Body Multifractality throughout Bosonic Superfluid and Mott Insulator Phases
We demonstrate many-body multifractality of the Bose-Hubbard Hamiltonian's ground state in Fock space, for arbitrary values of the interparticle interaction. Generalized fractal dimensions unambiguously signal, even for small system sizes, the emergence of a Mott insulator that cannot, however, be naively identified with a localized phase in Fock space. We …