Phase-ordering dynamics in itinerant quantum ferromagnets

Abstract

The phase-ordering dynamics that result from domain coarsening are considered for itinerant quantum ferromagnets. The fluctuation effects that invalidate the Hertz theory of the quantum phase transition also affect the phase ordering. For a quench into the ordered phase a transient regime appears, where the domain growth follows a different power law than in the classical case, and for asymptotically long times the prefactor of the t^{1/2} growth law has an anomalous magnetization dependence. A quench to the quantum critical point results in a growth law that is not a power-law function of time. Both phenomenological scaling arguments and renormalization-group arguments are given to derive these results, and estimates of experimentally relevant length and time scales are presented.

6pp., 1 eps fig, slightly expanded version

References in corpus (8)

• Influence of Generic Scale Invariance on Classical and Quantum Phase Transitions
• First order transitions and multicritical points in weak itinerant ferromagnets
• Domain Growth in Ising Systems with Quenched Disorder
• Local field theory for disordered itinerant quantum ferromagnets
• Quantum critical behavior in disordered itinerant ferromagnets: Logarithmic corrections to scaling
• Nonanalytic Magnetization Dependence of the Magnon Effective Mass in Itinerant Quantum Ferromagnets
• Ordering Dynamics of Heisenberg Spins with Torque: Crossover, Spinwaves and Defects
• Quantum Critical Behavior in Disordered Itinerant Ferromagnets: Instability of the Ferromagnetic Phase

Cited by in corpus (3)

• Metallic Quantum Ferromagnets
• Universal post-quench prethermalization at a quantum critical point
• Universal post-quench coarsening and quantum aging at a quantum critical point