Thermomagnetic power and figure of merit for spin-1/2 Heisenberg chain

Shunsuke Furukawa, Dai Ikeda, Kazumitsu Sakai

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Transport properties in the presence of magnetic fields are numerically studied for the spin-1/2 Heisenberg XXZ chain. The breakdown of the spin-reversal symmetry due to the magnetic field induces the magnetothermal effect. In analogy with the thermoelectric effect in electron systems, the thermomagnetic power (magnetic Seebeck coefficient) is provided, and is numerically evaluated by the exact diagonalization for wide ranges of temperatures and various magnetic fields. For the antiferromagnetic regime, we find the magnetic Seebeck coefficient changes sign at certain temperatures, which is interpreted as an effect of strong correlations. We also compute the thermomagnetic figure of merit determining the efficiency of the thermomagnetic devices for cooling or power generation.

Original languageEnglish
Pages (from-to)3241-3247
Number of pages7
JournalJournal of the Physical Society of Japan
Volume74
Issue number12
DOIs
Publication statusPublished - 2005 Dec 1
Externally publishedYes

Keywords

  • Figure of merit
  • Heisenberg chain
  • Magnetothermal effect
  • Quantum integrable system
  • Seebeck coefficient
  • Thermal conductivity
  • Transport properties

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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