Metamorphosis of the Quantum Hall Ferromagnet at $\nu = 2/5$

TL;DR

This paper investigates the evolution of the quantum Hall ferromagnet at filling factor 2/5, revealing a dynamical transition to a new, distinct quantum Hall state with unique temperature and time-dependent properties.

Contribution

It uncovers a novel zero-temperature quantum Hall state at ν=2/5 that emerges dynamically, differing from known spin-polarized and unpolarized states.

Findings

Observation of a dynamical transition to a new quantum Hall state.

Identification of a zero-temperature phase distinct from known states.

Strong temperature dependence and correlation with time in the new state.

Abstract

We report on the dramatic evolution of the quantum Hall ferromagnet in the fractional quantum Hall regime at $\nu = 2/5$ filling. A large enhancement in the characteristic timescale gives rise to a dynamical transition into a novel quantized Hall state. The observed Hall state is determined to be a zero-temperature phase distinct from the spin-polarized and spin-unpolarized $\nu = 2/5$ fractional quantum Hall states. It is characterized by a strong temperature dependence and puzzling correlation between temperature and time.