Inequivalence of the low-density insulating state and quantum Hall insulating states in a strongly correlated two-dimensional electron system

Abstract

We find that the behaviors of the voltage-current characteristics as one enters the low-density insulating state and integer quantum Hall insulating states in the ultra-clean two-dimensional electron system in SiGe/Si/SiGe quantum wells are qualitatively different. The double-threshold voltage-current curves, representative of the electron solid formation at low densities, are not observed in the quantum Hall regime, which does not confirm the existence of a quasi-particle quantum Hall Wigner solid and indicates that quasi-particles near integer filling do not form an independent subsystem.

As published

References in corpus (16)

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Cited by in corpus (1)

• Quantum Wigner solid in two-dimensional electron systems in semiconductors