Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.096803
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Funding
- National Science Foundation (NSF) [DMR-0352738, DMR-0803445, DMR-1005536]
- Department of Energy [DE-AIO2-04ER46133]
- Nanoscale Science and Engineering Initiative of the NSF [CHE-0641523]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005536, 0803691] Funding Source: National Science Foundation
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Even though composite fermions in the fractional quantum Hall liquid are well established, it is not yet known up to what energies they remain intact. We probe the high-energy spectrum of the 1/3 liquid directly by resonant inelastic light scattering, and report the observation of a large number of new collective modes. Supported by our theoretical calculations, we associate these with transitions across two or more composite fermions levels. The formation of quasiparticle levels up to high energies is direct evidence for the robustness of topological order in the fractional quantum Hall effect.
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