Thermal transport of the XXZ chain in a magnetic field

Details Thermal transport of the XXZ chain in a magnetic field Thermal transport of the XXZ chain in a magnetic field

2004-08-25

arxiv.org/abs/cond-mat/0408529v2

Phys. Rev. B 71, 184415 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages REVTeX4 including 5 figures, revised version, refs. added, typos corrected

Scientific paper

10.1103/PhysRevB.71.184415

We study the heat conduction of the spin-1/2 XXZ chain in finite magnetic fields where magnetothermal effects arise. Due to the integrability of this model, all transport coefficients diverge, signaled by finite Drude weights. Using exact diagonalization and mean-field theory, we analyze the temperature and field dependence of the thermal Drude weight for various exchange anisotropies under the condition of zero magnetization-current flow. First, we find a strong magnetic field dependence of the Drude weight, including a suppression of its magnitude with increasing field strength and a non-monotonic field-dependence of the peak position. Second, for small exchange anisotropies and magnetic fields in the massless as well as in the fully polarized regime the mean-field approach is in excellent agreement with the exact diagonalization data. Third, at the field-induced quantum critical line between the para- and ferromagnetic region we propose a universal low-temperature behavior of the thermal Drude weight.

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