Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.066804
Keywords
-
Categories
Funding
- National Science Foundation (NSF) [DMR-03-52738, DMR-0803445, CHE-0641523, DMR-1005536]
- U.S. Department of Energy (DOE) [DE-AI02-04ER46133]
- Gordon and Betty Moore Foundation
- NFS MRSEC through the Princeton Center for Complex Materials [DMR-0819860]
- Alexander von Humboldt Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803691, 1005536] Funding Source: National Science Foundation
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available