Metastable phase in the quantum Hall ferromagnet

Abstract

Time-dependent capacitance measurements reveal an unstable phase of electrons in gallium arsenide quantum well that occurs when two Landau levels with opposite spin are brought close to degeneracy by applying a gate voltage. This phase emerges below a critical temperature and displays a peculiar non-equilibrium dynamical evolution. The relaxation dynamics is found to follow a stretched exponential behavior and correlates with hysteresis loops observed by sweeping the magnetic field. These experiments indicate that metastable randomly-distributed magnetic domains are involved in the relaxation process in a way that is equivalently tunable by a change in gate voltage or temperature.

7 pages, including 4 figures Changes made to introduction Added figure Submitted to SSC

References in corpus (5)

• Resistance Spikes at Transitions between Quantum Hall Ferromagnets
• Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
• Resistance spikes and domain wall loops in Ising quantum Hall ferromagnets
• Interedge Phase Coherence in Quantum Hall Line Junctions
• Spins, charges and currents at Domain Walls in a Quantum Hall Ising Ferromagnet

Cited by in corpus (3)

• Magneto-transport in high g-factor, low-density two-dimensional electron systems confined in In_0.75Ga_0.25As/In_0.75Al_0.25As quantum wells
• Anti-crossings of spin-split Landau levels in an InAs two-dimensional electron gas with spin-orbit coupling
• Hysteresis in the quantum Hall regimes in electron double quantum well structures