Is There Another Scale in the Fractional Quantum Hall Effect ?

Abstract

We reanalyse theoretical considerations and experimental data, in an attempt to decide hether there is another scale in the fractional quantum Hall effect problem, in addition to the magnetic scale defined by the magnetic length $a_c$ or the cyclotron energy $\hbar ω_c$. We then discuss possible implications of a new scale on the formulation of a theoretical model of the fractional quantum Hall effect.