Ballistic magneto-thermal transport in a Heisenberg spin chain at low temperatures

Details Ballistic magneto-thermal transport in a Heisenberg spin chain at low temperatures Ballistic magneto-thermal transport in a Heisenberg spin chain at low temperatures

2008-08-04

arxiv.org/abs/0808.0380v2

Phys. Rev. B. 78. 144416 (2008)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.78.144416

We study ballistic thermal transport in Heisenberg spin chain with nearest-neighbor ferromagnetic interactions at low temperatures. Explicit expressions for transmission coefficients are derived for thermal transport in a periodic spin chain of arbitrary junction length by a spin-wave model. Our analytical results agree very well with the ones from nonequilibrium Green's function method. Our study shows that the transmission coefficient oscillates with the frequency of thermal wave. Moreover, the thermal transmission shows strong dependence on the intrachain coupling, the length of the spin chain, and the external magnetic field. The results demonstrate the possibility of manipulating spin-wave propagation and magnetothermal conductance in the spin-chain junction by adjusting the intrachain coupling and/or the external magnetic field.

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