Speaker
Description
Magnetic systems with momentum-dependent spin splitting provide fertile ground for discovering unconventional phases of matter beyond conventional ferromagnetism and antiferromagnetism.
The recently identified p-wave magnet represents a new class of magnetic order exhibiting odd-parity, time-reversal-symmetric spin splitting in momentum space, offering a promising platform for spintronic applications. We establish a microscopic interacting model that realizes the p-wave magnet as its ground state: starting from a Hubbard model, we derive the low-energy spin Hamiltonian and show that quantum order-by-disorder lifts the classical degeneracy and stabilizes the p-wave magnet. The resulting band structure exhibits finite spin accumulation via the Edelstein effect, highlighting its spintronic applications.[1]
Based on the symmetry principle, we further show that the momentum-dependent spin splitting in metallic altermagnets (d-wave magnets) naturally induces pair-density-wave superconductivity even in the absence of magnetic fields. Within a BCS framework, we identify Fulde–Ferrell and Fulde–Ferrell* states that spontaneously break inversion symmetry and exhibit nonreciprocal supercurrents, giving rise to a supercurrent diode effect.[2]
[1] Sim, G., & Rachel, S. (2025), ArXiv preprint arXiv:25xx.xxxxx
[2] Sim, G., & Knolle, J. (2025), Physical Review B, 112(2), L020502.
| Field of Condensed Matter | Theory |
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