Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Yuta Sekino, Yuya Ominato, Hiroyuki Tajima, Shun Uchino, Mamoru Matsuo
| Summary:
We investigate thermomagnetic transport in an ultracold atomic system with
two ferromagnets linked via a magnetic quantum point contact. Using
nonequilibrium Green’s function approach, we show a divergence in spin
conductance and a slowing down of spin relaxation that manifest in the weak
effective-Zeeman-field limit. These anomalous spin dynamics result from the
magnonic critical point at which magnons become gapless due to spontaneous
magnetization. Our findings unveil untapped dynamics in ultracold atomic
systems, opening new avenues in thermomagnetism.
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