A Quantized $\nu =5/2$ State in a Two-Subband Quantum Hall System

Abstract

The evolution of the fractional quantum Hall state at filling 5/2 is studied in density tunable two-dimensional electron systems formed in wide wells in which it is possible to induce a transition from single to two subband occupancy. In 80 and 60 nm wells, the quantum Hall state at 5/2 filling of the lowest subband is observed even when the second subband is occupied. In a 50 nm well the 5/2 state vanishes upon second subband population. We attribute this distinct behavior to the width dependence of the capacitive energy for intersubband charge transfer and of the overlap of the subband probability densities.

5 pages, 4 figures

References in corpus (3)

• Observation of a Fractional Quantum Hall State at $\nu =1/4$ in a Wide GaAs Quantum Well
• Evolution of the 7/2 fractional quantum Hall state in two-subband systems
• Observation of an in-plane magnetic-field-driven phase transition in a quantum Hall system with SU(4) symmetry

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