Collective excitations in chiral Stoner magnets
arXiv:2305.12508 · doi:10.1103/PhysRevLett.130.206701
Abstract
We argue that spin and valley-polarized metallic phases recently observed in graphene bilayers and trilayers support chiral edge modes that allow spin waves to propagate ballistically along system boundaries without backscattering. The chiral edge behavior originates from the interplay between the momentum-space Berry curvature in Dirac bands and the geometric phase of a spin texture in position space. The edge modes are weakly confined to the edge, featuring dispersion which is robust and insensitive to the detailed profile of magnetization at the edge. This unique character of edge modes reduces their overlap with edge disorder and enhances the mode lifetime. The mode propagation direction reverses upon reversing valley polarization, an effect that provides a clear testable signature of geometric interactions in isospin-polarized Dirac bands.
8pgs, 2fgs
References in corpus (12)
- Quantum Hall Ferromagnetism in Graphene
- Superconductivity in rhombohedral trilayer graphene
- Isospin magnetism and spin-triplet superconductivity in Bernal bilayer graphene
- Graphene integer quantum Hall effect in the ferromagnetic and paramagnetic regimes
- Collective Modes and Skyrmion Excitations in Graphene SU(4) Quantum Hall Ferromagnets
- Quantum cascade of new correlated phases in trigonally warped bilayer graphene
- Cascade of isospin phase transitions in Bernal bilayer graphene at zero magnetic field
- Topological Magnons and Edge States in Antiferromagnetic Skyrmion Crystals
- Spin relaxation in a single-electron graphene quantum dot
- Single-shot readout in graphene quantum dots
- Quantum topological phase transitions in skyrmion crystals
- Emergence of Neutral Modes in Laughlin-like Fractional Quantum Hall Phases
Cited by in corpus (5)
- Spin-frame field theory of a three-sublattice antiferromagnet
- Chiral Wigner crystal phases induced by Berry curvature
- Chiral Stoner magnetism in Dirac bands
- Helical edge modes in a triangular Heisenberg antiferromagnet
- Critical Behavior and Duality in Dimensionally Reduced Planar Chern-Simons Superconductors