Evidence of Landau levels and interactions in low-lying excitations of composite fermions at 1/3<or= nu <or=2/5

Excitation modes in the range 2/5>or=nu>or=1/3 of the fractional quantum Hall regime are observed by resonant inelastic light scattering. Spectra of spin-reversed excitations suggest a structure of lowest spin-split Landau levels of composite fermions that is similar to that of electrons. Spin...

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Bibliographic Details
Published in:Physical review letters 2003-01, Vol.90 (3), p.036803-036803, Article 036803
Main Authors: Dujovne, Irene, Pinczuk, A, Kang, Moonsoo, Dennis, B S, Pfeiffer, L N, West, K W
Format: Article
Language:English
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Summary:Excitation modes in the range 2/5>or=nu>or=1/3 of the fractional quantum Hall regime are observed by resonant inelastic light scattering. Spectra of spin-reversed excitations suggest a structure of lowest spin-split Landau levels of composite fermions that is similar to that of electrons. Spin-flip energies determined from spectra reveal significant composite fermion interactions. The filling factor dependence of mode energies displays an abrupt change in the middle of the range when there is partial population of a composite fermion level.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.036803