Observation of multiple magnetorotons in the fractional quantum Hall effect

B. S. Dennis, L. N. Pfeiffer, K. W. West, Moonsoo Kang, A. Pinczuk

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


The energies of critical points in dispersions of collective gap excitations of the fractional quantum Hall (FQH) states at v = 1/3 and 2/5 were measured. Evidence of two magnetoroton minima in the dispersion of gap modes at v = 2/5 and of a single minimum at v = 1/4 was obtained. Key predictions of Chern-Simons and composite fermion theories were confirmed.

Original languageEnglish (US)
Pages (from-to)2637-2640
Number of pages4
JournalPhysical review letters
Issue number12
StatePublished - Mar 19 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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