Exact Drude weight for the one-dimensional Hubbard model at finite temperatures
- 1 January 1998
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 31 (2) , 465-474
- https://doi.org/10.1088/0305-4470/31/2/008
Abstract
The Drude weight for the one-dimensional Hubbard model is investigated at finite temperatures by using the Bethe ansatz solution. Evaluating finite-size corrections to the thermodynamic Bethe ansatz equations, we obtain the formula for the Drude weight as the response of the system to an external gauge potential. We perform low-temperature expansions of the Drude weight in the case of half-filling as well as away from half-filling, which clearly distinguish the Mott-insulating state from the metallic state.Keywords
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