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Cyclotron spin-flip mode as the lowest-energy excitation of unpolarized integer quantum Hall states

Kulik, L. V. ; Kukushkin, I. V. ; Dickmann, S. ; Kirpichev, V. E. ; Vankov, A. B. ; Parakhonsky, A. L. ; Smet, J. H. ; Klitzing, Klaus von ; Wegscheider, Werner
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Date of publication of this fulltext: 11 Jan 2010 13:40


Abstract

The cyclotron spin-flip modes of spin unpolarized integer quantum Hall states (ν=2,4,6) have been studied with inelastic light scattering. The energy of these modes is significantly smaller compared to the bare cyclotron gap. Second-order exchange corrections are held responsible for a negative energy contribution and render these modes the lowest-energy excitations of unpolarized integer quantum Hall states.


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