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1.
Phys Rev Lett ; 107(6): 066804, 2011 Aug 05.
Article in English | MEDLINE | ID: mdl-21902358

ABSTRACT

We find unexpected low energy excitations of fully spin-polarized composite-fermion ferromagnets in the fractional quantum Hall liquid, resulting from a complex interplay between a topological order manifesting through new energy levels and a magnetic order due to spin polarization. The lowest energy modes, which involve spin reversal, are remarkable in displaying unconventional negative dispersion at small momenta followed by a deep roton minimum at larger momenta. This behavior results from a nontrivial mixing of spin-wave and spin-flip modes creating a spin-flip excitonic state of composite-fermion particle-hole pairs. The striking properties of spin-flip excitons imply highly tunable mode couplings that enable fine control of topological states of itinerant two-dimensional ferromagnets.

2.
Phys Rev Lett ; 97(3): 036804, 2006 Jul 21.
Article in English | MEDLINE | ID: mdl-16907529

ABSTRACT

Spin excitations from a partially populated composite fermion level are studied above and below nu=1/3. In the range 2/7

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