Observation of nonconventional spin waves in composite-fermion ferromagnets

U. Wurstbauer, D. Majumder, S. S. Mandal, I. Dujovne, T. D. Rhone, B. S. Dennis, A. F. Rigosi, J. K. Jain, A. Pinczuk, K. W. West, L. N. Pfeiffer

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish (US)
Article number066804
JournalPhysical Review Letters
Volume107
Issue number6
DOIs
StatePublished - Aug 2 2011

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magnons
fermions
composite materials
momentum
rotons
coupled modes
energy levels
excitons
energy
polarization
liquids
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Wurstbauer, U., Majumder, D., Mandal, S. S., Dujovne, I., Rhone, T. D., Dennis, B. S., ... Pfeiffer, L. N. (2011). Observation of nonconventional spin waves in composite-fermion ferromagnets. Physical Review Letters, 107(6), [066804]. https://doi.org/10.1103/PhysRevLett.107.066804
Wurstbauer, U. ; Majumder, D. ; Mandal, S. S. ; Dujovne, I. ; Rhone, T. D. ; Dennis, B. S. ; Rigosi, A. F. ; Jain, J. K. ; Pinczuk, A. ; West, K. W. ; Pfeiffer, L. N. / Observation of nonconventional spin waves in composite-fermion ferromagnets. In: Physical Review Letters. 2011 ; Vol. 107, No. 6.
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Wurstbauer, U, Majumder, D, Mandal, SS, Dujovne, I, Rhone, TD, Dennis, BS, Rigosi, AF, Jain, JK, Pinczuk, A, West, KW & Pfeiffer, LN 2011, 'Observation of nonconventional spin waves in composite-fermion ferromagnets', Physical Review Letters, vol. 107, no. 6, 066804. https://doi.org/10.1103/PhysRevLett.107.066804

Observation of nonconventional spin waves in composite-fermion ferromagnets. / Wurstbauer, U.; Majumder, D.; Mandal, S. S.; Dujovne, I.; Rhone, T. D.; Dennis, B. S.; Rigosi, A. F.; Jain, J. K.; Pinczuk, A.; West, K. W.; Pfeiffer, L. N.

In: Physical Review Letters, Vol. 107, No. 6, 066804, 02.08.2011.

Research output: Contribution to journalArticle

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AU - Majumder, D.

AU - Mandal, S. S.

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AU - Jain, J. K.

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AB - 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.

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Wurstbauer U, Majumder D, Mandal SS, Dujovne I, Rhone TD, Dennis BS et al. Observation of nonconventional spin waves in composite-fermion ferromagnets. Physical Review Letters. 2011 Aug 2;107(6). 066804. https://doi.org/10.1103/PhysRevLett.107.066804