Resonant inelastic light scattering investigation of low-lying gapped excitations in the quantum fluid at ν=5/2

U. Wurstbauer, K. W. West, L. N. Pfeiffer, A. Pinczuk

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33 Scopus citations

Abstract

The low-lying neutral excitation spectrum of the incompressible quantum Hall fluid at ν=5/2 is investigated by inelastic light scattering. Gapped modes are observable only in a very narrow filling factor range centered at 5/2 at energies that overlap estimates from transport activation gaps. The modes are interpreted as critical points in the wave-vector dispersion of excitations that preserve spin orientation. For very small changes |δν|â ‰ 0.01 the gapped modes disappear and a continuum of low-lying excitations takes over indicating the transition from an incompressible fluid at 5/2 to a compressible state. Observations of spin wave modes indicate spin polarization of the 5/2 and 2+1/3 quantum Hall fluids.

Original languageEnglish (US)
Article number026801
JournalPhysical review letters
Volume110
Issue number2
DOIs
StatePublished - Jan 7 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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