Non-dissipative Thermal Transport and Magnetothermal Effect for the Spin-1/2 Heisenberg Chain

Details Non-dissipative Thermal Transport and Magnetothermal Effect for the Spin-1/2 Heisenberg Chain Non-dissipative Thermal Transport and Magnetothermal Effect for the Spin-1/2 Heisenberg Chain

2004-10-08

arxiv.org/abs/cond-mat/0410192v2

J. Phys Soc. Jpn. 74 (2005) Suppl. pp.196-199

Physics

Condensed Matter

Statistical Mechanics

4 pages, references added, typos corrected, Conference proceedings of SPQS 2004, Sendai, Japan

Scientific paper

Anomalous magnetothermal effects are discussed in the spin-1/2 Heisenberg chain. The energy current is related to one of the non-trivial conserved quantities underlying integrability and therefore both the diagonal and off diagonal dynamical correlations of spin and energy current diverge. The energy-energy and spin-energy current correlations at finite temperatures are exactly calculated by a lattice path integral formulation. The low-temperature behavior of the thermomagnetic (magnetic Seebeck) coefficient is also discussed. Due to effects of strong correlations, we observe the magnetic Seebeck coefficient changes sign at certain interaction strengths and magnetic fields.

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