Low-energy spin rotons in the fractional quantum Hall effect

Sudhansu S. Mandal, J. K. Jain

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Abstract

Motivated by the discovery of extremely low-energy collective modes in the fractional quantum Hall effect [Kang, Pinczuk et al., Phys. Rev. Lett. 84, 546 (2000)], with energies below the Zeeman energy, we study theoretically the spin-reversed excitations for fractional quantum Hall states at ν = 2/5 and 3/7 and find qualitatively different behavior than for ν = 2/5 We find that a low-energy, charge-neutral “spin roton,” associated with spin-reversed excitations that involve a change in the composite-fermion Landau level index, has energy in reasonable agreement with experiment.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number20
DOIs
StatePublished - May 7 2001

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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