Quantum Spin Models of Commensurate p-Wave Magnets

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• P-wave magnetism, characterized by odd-parity, time-reversal-symmetric spin splitting, is a novel magnetic phase with significant spintronic potential.
• The fundamental mechanisms stabilizing p-wave magnetic phases are not well understood theoretically.

Purpose of the Study:

• To identify a microscopic interacting model that stabilizes the p-wave magnet phase.
• To elucidate the theoretical mechanism responsible for the stabilization of p-wave magnetism.
• To explore the potential of p-wave magnetism for spintronic applications.

Main Methods:

• Introduction of a Hubbard model.
• Derivation of the low-energy spin Hamiltonian.
• Analysis of classical and quantum fluctuation effects on magnetic states.

Main Results:

• A microscopic model realizing the p-wave magnet as its ground state was identified.
• Classical analysis showed stabilization but degeneracy with other states.
• Quantum fluctuations were found to lift degeneracy, uniquely selecting the p-wave magnet.
• The resulting electronic structure exhibits spin accumulation via the Edelstein effect.

Conclusions:

• Spontaneous p-wave magnetism is possible.
• The identified model and mechanism provide a theoretical foundation for p-wave magnets.
• Findings highlight the potential of p-wave magnetism for future spintronic devices and relate to materials like Ni_{2}Mo_{3}O_{8}.