Federico Bonetto, Vieri Mastropietro
Non-integrable fermionic chains near criticality.
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ABSTRACT.  We obtain the Drude weight and the critical exponents as functions of the 
density in non-integrable generalizations of XXZ or Hubbard chains, in the critical zero temperature regime where Luttinger liquid description breaks down and Bethe ansatz cannot be used. Our results are based on a fully rigorous two-regime multiscale analysis and a recently introduced partially solvable model.