Thermal conductivity of a weakly interacting Bose gas in quasi-one-dimension

Tomohiro Tanaka and Yusuke Nishida
Phys. Rev. E 106, 064104 – Published 5 December 2022

Abstract

Transport coefficients are typically divergent for quantum integrable systems in one dimension, such as a Bose gas with a two-body contact interaction. However, when a one-dimensional system is realized by confining bosons into a tight matter waveguide, an effective three-body interaction inevitably arises as leading perturbation to break the integrability. This fact motivates us to study the thermal conductivity of a Bose gas in one dimension with both two-body and three-body interactions. In particular, we evaluate the Kubo formula exactly to the lowest order in perturbation by summing up all contributions that are naively higher orders in perturbation but become comparable in the zero-frequency limit due to the pinch singularity. Consequently, a self-consistent equation for a vertex function is derived, showing that the thermal conductivity in quasi-one-dimension is dominated by the three-body interaction rather than the two-body interaction. Furthermore, the resulting thermal conductivity in the weak-coupling limit proves to be identical to that computed based on the quantum Boltzmann equation and its temperature dependence is numerically determined.

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  • Received 9 March 2022
  • Accepted 15 November 2022

DOI:https://doi.org/10.1103/PhysRevE.106.064104

©2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalFluid DynamicsStatistical Physics & ThermodynamicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Tomohiro Tanaka and Yusuke Nishida

  • Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8551, Japan

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Issue

Vol. 106, Iss. 6 — December 2022

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