Finite temperature Drude weight of an integrable Bose chain
نویسنده
چکیده
We study the Drude weight D(T ) at finite temperatures T of an integrable bosonic model where the particles interact via nearest-neighbour coupling on a chain. At low temperatures, D(T ) is shown to be universal in the sense that this region is equivalently described by a Gaussian model. This lowtemperature limit is also relevant for the integrable one-dimensional Bose gas. We then use the thermodynamic Bethe ansatz to confirm the low-temperature result, to obtain the high temperature limit of D(T ) and to calculate D(T ) numerically. PACS numbers: 05.30.-d, 05.30.Jp
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