Finite temperature Drude weight of an integrable Bose chain

Abstract

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 low-temperature 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.

11 pages, 2 figures

References in corpus (2)

• Bosonizing one-dimensional cold atomic gases
• The q-deformed Bose gas: Integrability and thermodynamics

Cited by in corpus (2)

• Low-temperature asymptotics of integrable systems in an external field
• Ballistic particle transport and Drude weight in gases