Observation of exchange Coulomb interactions in the quantum Hall state at nu=3

Details Observation of exchange Coulomb interactions in the quantum Hall state at nu=3 Observation of exchange Coulomb interactions in the quantum Hall state at nu=3

2010-11-09

arxiv.org/abs/1011.2022v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, to appear in PRB Rapid Communications

Scientific paper

Coulomb exchange interactions of electrons in the nu=3 quantum Hall state are determined from two inter-Landau level spin-flip excitations measured by resonant inelastic light scattering. The two coupled collective excitations are linked to inter-Landau level spin-flip transitions arising from the N=0 and N=1 Landau levels. The strong repulsion between the two spin-flip modes in the long-wave limit is clearly manifested in spectra displaying Coulomb exchange contributions that are comparable to the exchange energy for the quantum Hall state at nu=1. Theoretical calculations within the Hartree-Fock approximation are in a good agreement with measured energies of spin-flip collective excitations.

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