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 and 3/7 and find qualitatively different behavior than for 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.
- Received 8 September 2000
DOI:https://doi.org/10.1103/PhysRevB.63.201310
©2001 American Physical Society