TY - JOUR
T1 - Thermomagnetic power and figure of merit for spin-1/2 Heisenberg chain
AU - Furukawa, Shunsuke
AU - Ikeda, Dai
AU - Sakai, Kazumitsu
PY - 2005/12
Y1 - 2005/12
N2 - 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.
AB - 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.
KW - Figure of merit
KW - Heisenberg chain
KW - Magnetothermal effect
KW - Quantum integrable system
KW - Seebeck coefficient
KW - Thermal conductivity
KW - Transport properties
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U2 - 10.1143/JPSJ.74.3241
DO - 10.1143/JPSJ.74.3241
M3 - Article
AN - SCOPUS:29244455324
VL - 74
SP - 3241
EP - 3247
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 12
ER -