False Vacuum Decay in Flat-Band Ferromagnets: Role of Quantum Geometry and Chiral Edge States
arXiv:2512.13786 · doi:10.1103/q7ss-pvcq
Abstract
Dynamical control of quantum matter is a challenging, yet promising direction for probing strongly correlated states. Motivated by recent experiments in twisted MoTe that demonstrated optical control of magnetization, we propose a protocol for probing magnetization dynamics in flat-band ferromagnets. We investigate the nucleation and dynamical growth of magnetic bubbles prepared on top of a false vaccum in both itinerant ferromagnets and spin-polarized Chern insulators. For ferromagnetic metals, we emphasize the crucial role of a non-trivial quantum geometry in the magnetization dynamics, which in turn also provides a probe for the quantum metric. Furthermore, for quantum Hall ferromagnets, we show how properties of chiral edge modes localized at domain-wall boundaries can be dynamically accessed. Our work demonstrates the potential for nonequilibrium protocols to control and probe strongly correlated phases, with particular relevance for twisted MoTe and graphene-based flat-band ferromagnets.
arXiv comment4 pages main text + 7 pages Appendix and References; 4 + 2 figures
References in corpus (43)
- Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
- Topological insulators in twisted transition metal dichalcogenide homobilayers
- Signatures of Fractional Quantum Anomalous Hall States in Twisted MoTe2 Bilayer
- Observation of Fractionally Quantized Anomalous Hall Effect
- Quantum anomalous Hall effect from intertwined moiré bands
- Integer and fractional Chern insulators in twisted bilayer MoTe2
- Isospin magnetism and spin-triplet superconductivity in Bernal bilayer graphene
- Observation of integer and fractional quantum anomalous Hall effects in twisted bilayer MoTe2
- A mechanism for anomalous Hall ferromagnetism in twisted bilayer graphene
- Band geometry of fractional topological insulators
- Ferromagnetism in narrow bands of moiré superlattices
- Spontaneous fractional Chern insulators in transition metal dichalcogenides Moire superlattices
- Fractional Chern Insulator in Twisted Bilayer MoTe
- Anomalous Hall metal and fractional Chern insulator in twisted transition metal dichalcogenides
- Correlated Insulator and Chern Insulators in Pentalayer Rhombohedral Stacked Graphene
- Programming Correlated Magnetic States via Gate Controlled Moiré Geometry
- Family of ideal Chern flat bands with arbitrary Chern number in chiral twisted graphene multilayers
- Fractional topological phases and broken time reversal symmetry in strained graphene
- Anomalous Hall Crystals in Rhombohedral Multilayer Graphene I: Interaction-Driven Chern Bands and Fractional Quantum Hall States at Zero Magnetic Field
- False vacuum decay in quantum spin chains
- Theory of quantum anomalous Hall phases in pentalayer rhombohedral graphene moiré structures
- Collisions of false-vacuum bubble walls in a quantum spin chain
- Superconductivity, charge density wave, and supersolidity in flat bands with tunable quantum metric
- The Ginzburg-Landau theory of flat band superconductors with quantum metric
- Stability of Anomalous Hall Crystals in multilayer rhombohedral graphene
- Quantum Geometry and Stability of Moiré Flatband Ferromagnetism
- Heuristic bounds on superconductivity and how to exceed them
- Non-analytic behavior of 2D itinerant ferromagnets
- Spin-triplet superconductivity from quantum-geometry-induced ferromagnetic fluctuation
- Extracting quantum-geometric effects from Ginzburg-Landau theory in a multiband Hubbard model
- Quantum Geometric Kohn-Luttinger Superconductivity
- Quantum Geometry Probed by Chiral Excitonic Optical Response of Chern Insulators
- Nematic metal in a multi-valley electron gas: Variational Monte Carlo analysis and application to AlAs
- Valley Stoner Instability of the Composite Fermi Sea
- Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe monolayer
- Domain Formation Driven by the Entropy of Topological Edge Modes
- Optical Switching of Moiré Chern Ferromagnet
- Theory of Coulomb driven nematicity in a multi-valley two-dimensional electron gas
- Fractional Chern Insulator and Quantum Anomalous Hall Crystal in Twisted MoTe
- Topological magnons and domain walls in twisted bilayer MoTe
- Quantum anomalous Hall effects and emergent Hall ferromagnets at fractional filling of helical trilayer graphene
- False Vacuum Decay in Flat-Band Ferromagnets: Role of Quantum Geometry and Chiral Edge States
- Ephemeral Superconductivity Atop the False Vacuum