Eigenstates of fully many-body localized (FMBL) systems are described by quasilocal operators $tau_i^z$ (l-bits), which are conserved exactly under Hamiltonian time evolution. The algebra of the operators $tau_i^z$ and $tau_i^x$ associated with l-bits ($boldsymbol{tau}_i$) completely defines the eigenstates and the matrix elements of local operators between eigenstates at all energies. We develop a non-perturbative construction of the full set of l-bit algebras in the many-body localized phase for the canonical model of MBL. Our algorithm to construct the Pauli-algebra of l-bits combines exact diagonalization and a tensor network algorithm developed for efficient diagonalization of large FMBL Hamiltonians. The distribution of localization lengths of the l-bits is evaluated in the MBL phase and used to characterize the MBL-to-thermal transition.
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