Thermomagnetic Anomalies by Magnonic Criticality in Ultracold Atomic Transport
arXiv:2312.04280 · doi:10.1103/PhysRevLett.133.163402
Abstract
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.
16 pages, 6 figures
References in corpus (18)
- Spin Seebeck insulator
- Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
- Theory of magnon-driven spin Seebeck effect
- Spin transport in a tunable Heisenberg model realized with ultracold atoms
- Quantum gas microscopy of Kardar-Parisi-Zhang superdiffusion
- Far-from-equilibrium spin transport in Heisenberg quantum magnets
- Counting rule for Nambu-Goldstone modes in nonrelativistic systems
- Subdiffusion and heat transport in a tilted 2D Fermi-Hubbard system
- Two-terminal transport measurements with cold atoms
- Observation of first and second sound in a BKT superfluid
- Spin dynamics for bosons in an optical lattice
- Catching Bethe phantoms and quantum many-body scars: Long-lived spin-helix states in Heisenberg magnets
- Transverse spin dynamics in the anisotropic Heisenberg model realized with ultracold atoms
- Spin current noise of the spin Seebeck effect and spin pumping
- Microscopic theory of spin transport at the interface between the superconductor and a ferromagnetic insulator
- Theory of spin Peltier effect
- Thermography of the superfluid transition in a strongly interacting Fermi gas
- Preparation of the spin-Mott state: a spinful Mott insulator of repulsively bound pairs