Transport and Temperature: Exact spectrum and Drude weight for the one-dimensional infinite- U Hubbard model
This work provides an exact solution for charge transport in a one-dimensional Hubbard model with infinite interaction ($U o ext{infinity}$). By finding the exact energy spectrum, it derives closed-form analytical expressions for the charge Drude weight across different temperatures and doping levels. The key finding is that the temperature dependence of this weight changes based on whether the number or density of holes is fixed, offering a crucial guide for interpreting numerical simulations.