Spin Orbit Magnetism and Unconventional Superconductivity
arXiv:1211.1691 · doi:10.1103/PhysRevB.87.115134
Abstract
We find an exotic spin excitation in a magnetically ordered system with spin orbit magnetism in 2D, where the order parameter has a net spin current and no net magnetization. Starting from a Fermi liquid theory, similar to that for a weak ferromagnet, we show that this excitation emerges from an exotic magnetic Fermi liquid state that is protected by a generalized Pomeranchuck condition. We derive the propagating mode using the Landau kinetic equation, and find that the dispersion of the mode has a behavior in leading order in 2D. We find an instability toward superconductivity induced by this exotic mode, and a further analysis based on the forward scattering sum rule strongly suggests that this superconductivity has p-wave pairing symmetry. We perform similar studies in the 3D case, with a slightly different magnetic system and find that the mode leads to a Lifshitz-like instability most likely toward an inhomogeneous magnetic state in one of the phases.
5 pages, 3 figures
References in corpus (11)
- Quantum Theory of a Nematic Fermi Fluid
- Quantum phase transitions of metals in two spatial dimensions: I. Ising-nematic order
- Fermi liquid instabilities in the spin channel
- Dynamic generation of spin orbit coupling
- Effect of Ferromagnetic Spin Correlations on Superconductivity in Ferromagnetic Metals
- Fermi liquid parameters in 2D with spin-orbit interaction
- Electron self-energy near a nematic quantum critical point
- Fermi liquid near a quantum critical point
- Spin-orbit coupled Fermi liquid theory of ultra-cold magnetic dipolar fermions
- Generalized Pomeranchuk instabilities in graphene
- Pomeranchuk instabilities in multicomponent lattice systems at finite Temperature