We observe resonant Rayleigh scattering of light from quantum Hall bilayers at Landau level filling factor nu=1. The effect arises below 1 Kelvin when electrons are in the incompressible quantum Hall phase with strong interlayer correlations. Marked changes in the Rayleigh scattering signal in response to application of an in-plane magnetic field indicate that the unexpected temperature dependence is linked to formation of a nonuniform electron fluid close to the phase transition towards the compressible state. These results demonstrate a new realm of study in which resonant Rayleigh scattering methods probe quantum phases of electrons in semiconductor heterostructures.

Resonant Rayleigh scattering from bilayer quantum Hall phases

LUIN, Stefano;
2006

Abstract

We observe resonant Rayleigh scattering of light from quantum Hall bilayers at Landau level filling factor nu=1. The effect arises below 1 Kelvin when electrons are in the incompressible quantum Hall phase with strong interlayer correlations. Marked changes in the Rayleigh scattering signal in response to application of an in-plane magnetic field indicate that the unexpected temperature dependence is linked to formation of a nonuniform electron fluid close to the phase transition towards the compressible state. These results demonstrate a new realm of study in which resonant Rayleigh scattering methods probe quantum phases of electrons in semiconductor heterostructures.
quantum Hall bilayers, quantum phase transition, light scattering, semiconductor heterostructures; ELECTRON-SYSTEMS, LOCALIZATION, EXCITATIONS, SPECTRUM, QUANTUM WELLS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/5178
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