Cyclotron spin-flip excitations in a ν=1/3 quantum Hall ferromagnet

Details Cyclotron spin-flip excitations in a ν=1/3 quantum Hall ferromagnet Cyclotron spin-flip excitations in a ν=1/3 quantum Hall ferromagnet

2008-12-29

arxiv.org/abs/0812.4890v1

Phys.Rev.Lett. 102, 206802 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages,3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.102.206802

Inelastic light scattering spectroscopy around the \nu=1/3 filling discloses a novel type of cyclotron spin-flip excitation in a quantum Hall system in addition to the excitations previously studied. The excitation energy of the observed mode follows qualitatively the degree of electron spin polarization, reaching a maximum value at \nu=1/3 and thus characterizing it as a \nu=1/3 ferromagnet eigenmode. Its absolute energy substantially exceeds the theoretical prediction obtained within the renowned single-mode approximation. Double-exciton corrections neglected utilizing the single-mode approach are evaluated within the framework of the excitonic representation and are inferred to be responsible for the observed effect.

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